Dual Boot Ubuntu Macbook Pro 8,1
I have learned through trial and error (mostly error) that the newest Macbook Pro (early 2011 8,1) has a problem with ubuntu liveCDs and will not boot from them. I want to get Ubuntu running primarily so I can root my android phone. As of now I have Ubuntu 11.10 running on a virtual machine with VirtualBox but virtual machines don't work for rooting purposes. Is there still a way to dual boot a Macbook Pro 8,1 with Ubuntu?
Ubuntu Live CD's are designed for generic PC machines, not Mac's with a GUID Partition Table and EFI.
Booting and installing Ubuntu on a Mac can brick the machine, as the header on the GPT has a partial MBR like Windows full MBR, so it's mistaken for one and attmepts to install.
Also Linux requires two partitions, one a swap partition which it mistakes the hidden EFI partiton for that.
Getting a Lion based Mac to dual boot Linux is much harder than Snow Leopard, as there is a new hidden Lion Recovery Partiiton to deal with, also on the newer 2011 Mac's with recent firmware updates has caused all sorts of headaches for the required rEFIt needed (hasn't been updated) and creating two more partitions that Linux requires.
If you had a pre 2011 Mac and no Lion, just Snow Leopard, I would say no problem.
A much better option for you is to get a inexpensive machine and install Linux on it, or buy one already installed, until this Lion buisness settles down and urber geeks tweek Linux on Mac's again, but right now it's appearing Apple has charted a course for a closed operating system like a iPhone/iPad and that doesn't generate a whole lot of interest in running Linux on Mac's.
http://www.system76.com/index.php/
Similar Messages
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Can I dual boot a macbook pro running Mavericks with Snow Leopard?
I just got a Macbook Pro with quad core i7 with osx 10.9.5 but need to run software that will not run on a system higher that 10.6.8. How can I partition the drive so that I can install these?
There have been discussions in ASC about using a virtualization software to then
run an older 'server version' of Snow Leopard on a partition within a newer Mac...
You can still buy the Server version of Snow Leopard from Apple. Not sure which
virtualization software or utility you'd need to set it up, though; or if you'd also need
to use BootCamp to set-aside a partition as well.
My antiques don't have a feel that sort of thing...
Good luck & happy computing! -
Dual-booting Ubuntu 13.04 with Windows 8 on a U410
Hi!
I have a U410 on which I would like to dual-boot Ubuntu 13.04.
I've run it up on a live flash drive, everything works OK.
When it comes to the actual install I'm a bit nervous as I've never had a machine like this before, it's only two months old, and I've never had a machine where I didn't have a Windows install disk!
The installer sees the 500 GB HDD, so I assume I can create a partition on that.
Where do I put the boot loader though? It's telling me it wants to put it on the SSD.
Is this where it should go?
Are there any detailed steps listed anywhere?
I'm assuming that because the installer sees all the partitions and disks, I don't need to turn off UEFI or RAID....
Thanks!I've been using Ubuntu on this computer since 12.04 was released and since this thread wasn't closed I'll provide some closing documentation for other u410 users. Ubuntu is growing in popularity and this should help with new users.
Please note that I bought a u410 Ultra with Windows 7 (intentionally) and things may have changed since the new Windows release.
________Intro________________________
It is best to know how Intel Rapid Start Technology works before messing with your partition table. Windows is installed on the HDD (500/1tb depending on model) with a 2nd partition holding the drivers necessary for one-push recovery. Note that modifying Intel RST, any files on the 30gb SSD or removing the recovery partition with the windows drivers will break one-push recovery. Because of this you should learn how to reinstall windows 7/8 using a USB driver before you continue.
________ Prep_________________
Assuming you know how to install Windows, and you backed up the recovery partition onto your USB drive (or got drivers from the laptops support page on Lenovo.com it is now time to install Ubuntu.
Download the Ubuntu ISO from their website, and download univeral usb installer from here:
http://www.pendrivelinux.com/downloads/Universal-USB-Installer/Universal-USB-Installer-1.9.3.6.exe
Usage of the USB installer is pretty straightforward, I can follow through with a how to if a reader needs it.
__________ Prerequisites____________
Now that you have a bootable USB drive, reboot into the computers BIOS and disable 'Intel Smart Response Technology'. This takes frequently used Windows files from the HDD and puts them on the SSD for quicker access. Removing the SSD or modifying it's contents only has the side effect of Windows booting and running a little slower.
Installation
Now you have three options:
-If you primarily use Windows, you can reinstall it onto the 30GB SSD
-Install Ubuntu on the SSD, and leave windows untouched
-Your last option is to put both Ubuntu and Windows on the HDD and not use your SSD at all.
I chose the 2nd option, I put ubuntu on the SSD. In addition to putting Ubuntu on the SSD for SSD speeds, I split my HDD in half. 500gb for Ubuntu and 500gb for Windows.
When I got to "Where to install Ubuntu" I chose custom. Here you will see two devices /dev/sdax (x being a number assigned to the drive, usually 1) and /dev/hdax. SD for SDD and HD for HDD.
The SSD should have two paritions, one is a fat32 partition with the name 'efi'. Dont touch this, it is used to store secure boot keys so the computer will boot Windows. Ubuntu is versatle and can reuse the Windows efi file.
The rest of the SSD is a ~30gb ntfs partition. Since you disabled Intel RST the SSD isn't going to be used at all. So you can install Windows or Ubuntu here for fast boots, it can't however fit both comfortably.
In this guide I will install Ubuntu here, creat an ext4 partition here, and for the mount point choose /
Switch to /dev/hda and shrink the Windows partition to half this size, do this by dividing the total disk space by 2 (the partitioning software counts in increments of 1024 so if you want a different size you can choose so with some simple math).
Most seasoned Linux users recommend making at the very least a 2nd partition for /home. In Linux this is where all your personal data is stored, you can reinstall any Linux distro and if you mount /home all your files will be right where they used to be. Its similiar to having a Data partition or a separate Harddrive for data if you're using Windows. In linux the transition from SSD is HDD seamless, it's all done in the background for you. I have done exactly this.
Now that your Windows partition on the HDD is shrunk down. Creat an ext4 partition in the newly freed space, for the mount point, click the drop down menu and choose /home.
Finish the installation.
________ Jumping through hoops______________
For me, 12.04.1 and 12.04.2 didn't install correctly because it didn't properly use grub-uefi. 12.10 installed and booted fine and when I used 13.04 on release day it didn't install properly (this could've been changed, if you check 'install updates while installing in present day it may go through.
Because of this issue, of not booting 13.04 (raring) I installed 12.10 and ran these commands in terminal:
$ sudo apt-get update
$ sudo apt-get install updates
$ sudo apt-get dist-upgrade
When you reboot you will see an option for Ubuntu and an entry for Windows.
________ Conclusion / TL;Dr _______________-
My disk scheme looks like this:
SSD:
262mb efi partition
30gb ext4 partition mounted point: /
HDD:
500gb ext4 mount point /home
500gb NTFS partition 'Windows'
I recommend updating Ubuntu Raring and rebooting one more time, updates will push you to the newer 3.8 and 3.9 Linux kernels which a much more power efficient and run well on Sandy and Ivy Bridge Intel computers.
I hope this helps, if anyone has any questions feel free to ask. I hope this imformation is worth the nasty bump. -
I can not boot my MacBook Pro. How do I get and save the data that is not backed up??
I can not boot my MacBook Pro running on Lion 10.7.4. I pressed control, comment P and R keys and O got to the disk utility, then I tried to repair disk and it can not be repaired. I get a message that tells me to back up as much data as possible ?. But if I can not open the computer how can I save my data??
I have a back up until 2 weeks ago on time machine. but the work of the last 2 weeks is extremely important how can I get it??
If I use m time machine backup do I loose the additional data of the last two weeks!,
Please help.. It's a huge amount of work that I have done and can not loose itIf it were me, I'd get a new hard drive or SSD and put it in an external enclosure. Boot into the recovery partition, format the new drive (not the old one) and install the OS to it. Shut down the Mac, open it up, and swap the drives. You may be able to read your data from the old one externally if you're lucky. If you're very lucky you may be able to use Migration Assistant to move all your stuff to the new drive.
Look at ifixit.com for the exact procedure to get to the drive on your model. If it's a unibody it's pretty simple.
http://www.amazon.com/Sabrent-2-5-Inch-Aluminum-Enclosure-EC-TB4P/dp/B005EIGUD4/ ref=sr_1_3?ie=UTF8&qid=1392154588&sr=8-3&keywords=2.5+enclosure -
Cannot boot my MacBook Pro. Tryed CMD+R, reinstall OS, error message :damaged HD. When trying to repait it says it's OK. Yesterday HD wasn't even half full when I turned it off, now it says it's full.
What may have happened is an error and a kernel panic, filling up the logfiles.
What I recommend is first to find a way to backup your data without booting the hard drive directly if it isn't already backed up, and then get Alsoft Disk Warrior to repair the hard drive. You'll probably want an external drive from http://www.macsales.com/
And you'll want to go into Hard drive -> Library -> Logs, System -> Library -> Logs, and Users -> yourname -> Library -> Logs to remove whatever you find there.
If after booting it fills up again, start by removing all startup items in your System Preferences for your user, and rebooting in safe mode with the shift key held down. If the hard drive is over 85% full after removing the logfiles, you may want to look at what were the last applications you installed.
Peer2peer software if installed can be as bad as a virus, because it enables others to access your computer. Insecure wireless networks are just as bad, if they are WEP or no encryption and someone is within 1500 feet of your computer.
If no such software is installed, your RAM probably has failed. Run the hardware test that came with your computer, by booting with the 'D' key.
If nothing shows up there, it can still be the RAM. Especially if you've seen any 4 language screens telling you to restart.
Here's more on kernel panics:
http://www.macmaps.com/kernelpanic.html* -
I cannot start up / boot my MacBook Pro (15"). When I power it up, all I get is a 'persistant gray screen' with that gear icon spinning under the apple.
I did run a 'safe boot', and saw that I had 2 possible errors that might be causing it:
1) 'lanchctl: dubious permissions on file. /Library/LaunchDaemons
2) 'lanchctl: dubious permissions on file. /etc./mach_init.d
Also, there was a line that said that my 'IPv6' was disabled ??
If anyone knows what I can do to fix this, I would be very grateful. All my songs and videos and pics are on my mac,and I have had it since 2007.
Thank you kindly,
Gino
[email protected]Try a SMC reset:
http://support.apple.com/kb/ht3964
Ciao. -
Pre-configured dual-boot Ubuntu and Windows
Of possible interest to the Linux folks: A newly opened Laptops with purpose store is now offering several popular ThinkPad models fully pre-configured with dual-boot Ubuntu Linux and Windows.
These systems come with a lot of pre-installed applications, see Dual boot Linux and Windows page for details.
At the moment, we are working on specific solutions for students, educators, scientists, designers...
Would love to have some feedback from the community on the existing offerings as well as suggestions/wishes for the future ones.That would be fine if some hp machines didn't have broken UEFI that don't respect setting the default OS.
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Each time I boot my Macbook Pro running a currently patched version of Yosemite I am asked to "Sign in with my Apple ID." After that I have to approve the use of Find My Mac, and then I have to agree to the Terms and conditions of Use. This is very annoying since I use Bootcamp a lot and it adds a fair effort to the reboot process. Any thoughts?
Some additional clues that may or may not have bearing on this.
Once I am booted into Yosemite completely, if I open Safari (also current version) I am told my Safari Extensions have been migrated and I have to re-enable each one individually. They have all been disabled. This will occur each time I completely close Safari and reopen it.
I appreciate your thoughts and suggestions everyone! Thanks in advance.
DaveHi chc517,
I'm sorry to hear you are having issues with your MacBook Pro. I also apologize, I'm a bit unclear on a couple things about your specific configuration. The message you mentioned about the disk being encrypted would seem to indicate that you may have File Vault enabled. If that is the case and you are having a login issue, you would need to use the File Vault recovery key to reset your login password instead of your Apple ID, as noted in the following article:
OS X Yosemite: FileVault recovery key
Regards,
- Brenden -
when I try to boot my macbook pro the startup manager doesn't show any drives. How can I solve this issue?
Please confirm what version of OS X you are running - I doubt it is the ancient OS 10.1 !
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Triple Boot 2010 Macbook Pro with Dual Drive
I have a 2010 Macbook pro running Mavericks and Windows 7 on a 250gb SSD. I just removed the cd drive and installed my old 250 gb hard drive. So now I have two drives. I would like to make the hard drive purely for a linux distribution.
How should I go about doing this?
Some things to note/ consider:
1. I have no CD drive so I would like to boot up from a USB.
2. I read that Mavericks has issues with dual booting. So I can't trust many sources?
3. What file format should I erase the new drive to.
4. Also should I use rEFInd for booting purposes?
5. I am aware there are plety of tutorials that walk you through installing linux but I want to have
A second hard drive JUST for linux.
My current plan is:
Reformat drive with Mac OS Extended (journalized).... Install rEFInd.... Burn ubuntu ISO to flash drive... install ubuntu though rEFInd?
I have no clue if this is at all correct
Thanks in advance...First the scratch. Like you said, most everyone has a different take on scratch discs but I'd guess you're wasting one heck of a lot of hard drive space using all 500 GB for Scratch, did I read that right? If I did read it correctly YES, partition it and get some use out of it!!
I've got a unibody MBP 2.93GHz, OS 10.5.8, CS3 & PS 5 (running in 32bit mode), and 8 gigs of ram. I've partitioned the one 300 GB drive so 50GB is scratch, the other partition is for OS, & Apps, and documents (images).
I use LR 2 first than export to PS 5 to finish up. My photos get to be 300MB to 500MB in size and both versions of PS work on this setup just fine. Using PS 5 in 64 bit mode is faster opening files but NON of my plugin's are 64 bit yet, that's why I'm still stuck in 32 bit mode.
Not knowing what size or kind of files you work on makes giving advice a bit tough but try setting the status indicator (don't know the right name for it) in the bottom left corner of any PS open file to "Efficiency" and watch what happens when you process your files. I rarely see mine drop below 90%, I've got the usable RAM in PS Prefs set to it's max suggested, cut way back on History and Cache.
Can't wait for NIK and others to offer their plugin in 64 bit, later this year is what I was told.
There used to be an old "rule of thumb" with old version of PS about Scratch disc size. I don't remember exactly but it may have been 3 to 5 times the size of your biggest file??
Good luck, Alan -
Dual hard drive macbook pro, triple boot, win7 won't load
As you have requested @ChristopherMurphy:
I've got somewhat of a unique situation (I believe).
I have a 13" Macbook Pro 9,2 (mid-2012). It came with a 750gb SATA HDD and internal optical drive. I installed a Samsung 840 Pro 256gb SSD in place of the HDD, then put the HDD in place of the optical drive. I have the system set up so that the SSD is my primary OSX drive with one single visible partition. Then I have the HDD set up so that the first 500gb is an HFS partition, and the rest is set aside for bootcamp. It was originally one 750gb single HFS partition, but then I used the boot camp assistant to section off the last 250gb for windows.
For the life of me I couldn't get a bootcamp install to work off of a Boot Camp Assistant created a x64 Win7 USB stick, until I read somewhere that I needed to actually disconnect the sata connector for my SSD. This worked, and Win7 was able to format from FAT32 to NTFS, then install and boot correctly from the HDD (with the SSD unplugged), and leave the HFS 500gb partition intact.
Then when I plugged back in the SSD, OSX can see that there is a bootable partition when I go in to "Choose Startup Disk" in SysPrefs, and if I hit the option key while booting, but all I get is a black screen with a blinking cursor. I believe that x64 Win7 is mad at me because I have changed the drive numbers that it uses to references how to boot up properly. I believe the solution may lay in running a Win7 boot repair set of commands, but I can't seem to access the Win 7 recovery console or "Repair Installation" feature using the USB stick that BCA created.
To complicate matters further, I successfully created a Ubuntu 13.04 USB stick, used rEFIt to boot off of it, and then had it split off and use the second half of my 250gb ntfs partition on the HDD to install linux.
To complicate things even further, I am using filevault2 with FIPS encryption module to encrypt both the SSD, and the HFS partition on the HDD.
I have installed rEFIt and used "bless" to have it be my boot selection menu (as instructed here: https://wiki.debian.org/InstallingDebianOn/Apple/MacBookAir/2-1#EFI_and_Partitio ning). I can boot successfully into OSX, and I can boot successfully into Ubuntu. I still can't boot into Win7 though.
Here is the output from a variety of commands I've seen you ask others for: (http://pastebin.com/u3V01iWR)
mbltccmbp:~ trevorcobb$ diskutil list
/dev/disk0
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *750.2 GB disk0
1: EFI 209.7 MB disk0s1
2: Apple_CoreStorage 501.8 GB disk0s2
3: Apple_Boot Boot OS X 134.2 MB disk0s3
4: Microsoft Basic Data BOOTCAMP 124.0 GB disk0s4
5: Microsoft Basic Data 115.5 GB disk0s5
6: Linux Swap 8.5 GB disk0s6
/dev/disk1
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *250.1 GB disk1
1: EFI 209.7 MB disk1s1
2: Apple_CoreStorage 249.2 GB disk1s2
3: Apple_Boot Recovery HD 650.0 MB disk1s3
/dev/disk2
#: TYPE NAME SIZE IDENTIFIER
0: Apple_HFS Macintosh SSD *248.9 GB disk2
/dev/disk3
#: TYPE NAME SIZE IDENTIFIER
0: FDisk_partition_scheme *8.3 GB disk3
1: DOS_FAT_32 WININSTALL 8.3 GB disk3s1
/dev/disk4
#: TYPE NAME SIZE IDENTIFIER
0: Apple_HFS Macintosh HD *501.5 GB disk4
mbltccmbp:~ trevorcobb$ sudo gpt -r -v show disk0
Password:
gpt show: disk0: mediasize=750156374016; sectorsize=512; blocks=1465149168
gpt show: disk0: Suspicious MBR at sector 0
start size index contents
0 1 MBR
1 1 Pri GPT header
2 32 Pri GPT table
34 6
40 409600 1 GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B
409640 980102336 2 GPT part - 53746F72-6167-11AA-AA11-00306543ECAC
980511976 262144 3 GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC
980774120 792
980774912 242186240 4 GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7
1222961152 225603584 5 GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7
1448564736 16582656 6 GPT part - 0657FD6D-A4AB-43C4-84E5-0933C84B4F4F
1465147392 1743
1465149135 32 Sec GPT table
1465149167 1 Sec GPT header
mbltccmbp:~ trevorcobb$ sudo gpt -r -v show disk1
gpt show: disk1: mediasize=250059350016; sectorsize=512; blocks=488397168
start size index contents
0 1 PMBR
1 1 Pri GPT header
2 32 Pri GPT table
34 6
40 409600 1 GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B
409640 486717952 2 GPT part - 53746F72-6167-11AA-AA11-00306543ECAC
487127592 1269536 3 GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC
488397128 7
488397135 32 Sec GPT table
488397167 1 Sec GPT header
mbltccmbp:~ trevorcobb$ sudo fdisk /dev/disk0
Disk: /dev/disk0 geometry: 91201/255/63 [1465149168 sectors]
Signature: 0xAA55
Starting Ending
#: id cyl hd sec - cyl hd sec [ start - size]
1: EE 0 0 1 - 1023 254 63 [ 1 - 409639] <Unknown ID>
2: DA 25 127 15 - 1023 254 63 [ 409640 - 980102336] <Unknown ID>
3: AF 1023 254 63 - 1023 254 63 [ 980511976 - 262144] HFS+
*4: 07 1023 254 63 - 1023 254 63 [ 980774912 - 242186240] HPFS/QNX/AUX
mbltccmbp:~ trevorcobb$ sudo fdisk /dev/disk1
Disk: /dev/disk1 geometry: 30401/255/63 [488397168 sectors]
Signature: 0xAA55
Starting Ending
#: id cyl hd sec - cyl hd sec [ start - size]
1: EE 1023 254 63 - 1023 254 63 [ 1 - 488397167] <Unknown ID>
2: 00 0 0 0 - 0 0 0 [ 0 - 0] unused
3: 00 0 0 0 - 0 0 0 [ 0 - 0] unused
4: 00 0 0 0 - 0 0 0 [ 0 - 0] unusedUbuntu was installed after Windows 7, that is correct.
Ubuntu and Win7 are installed on the final 250gb section of the 750gb hdd that I have connected to the Optical Drive SATA connector using a HDD optibay caddy.
i can successfully boot into the Filevault2 unlock screen, then into OSX on the SSD using the stock Apple EFI or rEFIt.
i can also successfully boot into Ubuntu using rEFIt.
The Apple EFI bootloader and rEFIt both can see the Windows installation and claim to be able to boot it, but it just hangs at a black screen with blinking cursor.
i have quite a bit of experience messing with partition tables in troubleshooting a friend's borked dell laptop that had a bunch of dell custom partitions on the drive. i've used Hiren's bootcd and many of the tools on it before. This EFI GPT + MBR stuff is a whole different animal for me though.
Can I use any of the commands listed below from a windows 7 recovery USB stick?
Bcdboot C:\windows
BOOTREC /FIXMBR
BOOTREC /FIXBOOT
BOOTREC /REBUILDBCD
BOOTREC /SCANOS -
Dual Booting Ubuntu with OS X and Windows 8 Bootcamp?
I have Windows 8 Consumer Preview installed via Bootcamp, and OS X Lion as well. My question is: how would I install Ubuntu on another partition? So that when I held Option and started up my MacBook Pro, it would show Ubuntu as an option to boot. I already have Ubuntu 12.04 burned onto a disk, I just have no idea if it's safe to boot into the CD and install. Is it alright?
Another thing, if it's required, I would be willing to delete my Windows Bootcamp partition.Choose Show Toolbar or Customize Toolbar from the View menu and put it back.
(68254) -
[Solved] Triple Boot on MacBook Pro
Hi all,
I'm trying to install archlinux with Mac OS X and Windows, even following this guide (https://wiki.archlinux.org/index.php/MacBook).
I partitioned the disk as recommended by the guide so now I have the following partitions:
-Boot partition Mac
-Macintosh HD
-Partition in which I am trying to install Arch
-Partition in which I successfully installed Windows
I followed the installation step by step, until the bootloader installation. I reboot to sync the partition tables in rEFIt, but it's written that I don't have to synchronize and shows dev/sda3 in HPS+ despite is in ext4.
The problem then is that I can't install Grub as suggested in the guide (the only option that shows me is installed in dev / sda in which the partition boot the Mac), so refit doesn't recognize the partition of linux and shows only mac and windows.
Thanks in advance.
Last edited by User0 (2012-02-06 00:06:24)How did you "solve" this? I recently acquired a new Macbook Pro as well, and want to dual boot with Arch, so I am curious as to what steps you did to make it work.
-
Boot loop after dual booting ubuntu 14.04 LTS
I had an original version of windows 8 which worked properly.But after i dual booting with ubuntu windows takes about 10 to 15 mins to start and sometimes it gets stuck at the boot logo with nowhere to go
even ubuntu also shows there is a system problem.
Please help..Anything plugged into the ports like an external hard drive? What AV program are you using? How about opening task manager and look at the processes once it boots up and see if anything looks strange in there, like a process running heavy.
Sorry for the late reply.
Regard,
Dave
T430u, x301, x200T, x61T, x61, x32, x41T, x40, U160, ThinkPad Tablet 1838-22R, Z500 touch, Yoga Tab 2 Windows 8.1, Yoga Tablet 3 Pro
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Macbook Pro 15inch Early 2011 very long boot time, Macbook Pro 15inch Early 2011 very long boot time
I have the macbook pro early 2011 15inch. i7 processor, 500gb hard drive, and 4gb ram and have Moutain lion installed. The computer takes a good minute to boot to the login screen and then probably another 30 - 45 seconds to actually login and be able to do stuff on the desktop.
The comptuer has plenty of hard drive space, about 370gb. I dont think it should be taking this long for my comptuer to boot up. What can I do to make this boot time faster? (I am currently looking to get an ssd but that wont be for a while untill i get the money) So what can I do in the meantime to help it boot faster?First go to Disk Utility and verify disk and repair if needed then repair permissions. Do you have any antivirus installed? Then go through all of your apps and check to make sure they are compatible using www.roaringapps.com. I guarantee it is an incompatible app or antivirus causing the issue. Also, look at Thomas A Reeds, Understanding Upgrade Nightmares article, http://www.reedcorner.net/understanding-upgrade-nightmares/
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