Not able to resize and make a partition of my startup disk

Question

Hi, I'm running Lion on a late - 2010 15 inch MBP and I already have a Boot Camp partition of Windows 7. I wanted to partition my hard drive again to install Ubuntu (which should be relatively painless). I tried out the live CD to get a taste of what it would be like, and actually tried partitioning from there, which did not work. So I booted back to OSX and went to Disk Utility, selected my drive and tried to resize my Macintosh HD partition to make space for a 4ish GB partition for Ubuntu. I hit Apply, but then I get this error:
Partition failed with the error:
File system resize support required, such as HFS+ with Journaling enabled.
My Macintosh HD is of type Mac OS Extended (Journaled), and my Bootcamp is NTFS. I see EFI and Recovery HD partitions that I haven't seen before, but I understand they have always been there but were hidden.
I tried repairing disk permissions, and it works for the Macintosh HD, but when I try for the entire drive I get this error, even though I clearly have an EFI system partition that I can see:
This disk doesn’t contain an EFI system partition. If you want to start up your computer with this disk or include it in a RAID set, back up your data and partition this disk.
I ran diskutil disk in Terminal and this is what I get. Looks alright to me:
/dev/disk0
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *320.1 GB   disk0
   1:                  Apple_HFS EFI                     209.7 MB   disk0s1
   2:                  Apple_HFS Macintosh HD            285.1 GB   disk0s2
   3:                  Apple_HFS Recovery HD             650.0 MB   disk0s3
   4:       Microsoft Basic Data BOOTCAMP                29.1 GB    disk0s4
   5:                        EFI                         209.7 MB   disk0s5
So what do I do so I can partition my disk successfully? I'm willing to backup and erase my harddrive completely to install Lion again, but I recently did that (well, a few months ago) when I felt that updating from Snow Leopard without a clean install was laggy. So I hope there's a way I can do this without doing a clean install again.
Thanks a lot, and this is my first question so I hope I've provided enough info.

Answer 1

I am experiencing the same problem and was interested in how this was resolved?
Searching for disks...
The device does not support mode page 3 or page 4,
or the reported geometry info is invalid.
WARNING: Disk geometry is based on capacity data.
The current rpm value 0 is invalid, adjusting it to 3600
done
Specify disk (enter its number): 14
selecting c4t50060168446040CCd0
[disk unformatted]
Disk not labeled. Label it now? y
Warning: error writing VTOC.
Not ready error during read
ASC: 0x4 ASCQ: 0x3
Warning: error reading backup label.
Not ready error during read
ASC: 0x4 ASCQ: 0x3
Warning: error reading backup label.
Not ready error during read
ASC: 0x4 ASCQ: 0x3
Warning: error reading backup label.
Not ready error during read
ASC: 0x4 ASCQ: 0x3
Warning: error reading backup label.
Not ready error during read
ASC: 0x4 ASCQ: 0x3
Warning: error reading backup label.
Warning: no backup labels
Write label failed
The configuration is:
SunOS 5.10 Generic_137137-09 sun4v sparc SUNW,T5240
SG-XPCIE2FC-QF4 QLogic Dual-Port FC HBA Card
# cfgadm -alv c4
Ap_Id Receptacle Occupant Condition Information
When Type Busy Phys_Id
c4 connected configured unknown
unavailable fc-fabric n /devices/pci@500/pci@0/pci@d/QLGC,qlc@0,1/fp@0,0:fc
c4::50060168446040cc connected configured unknown DGC RAID 5
unavailable disk n /devices/pci@500/pci@0/pci@d/QLGC,qlc@0,1/fp@0,0:fc::50060168446040cc
Your assistance would be greatly appreciated.