Linux ext4 partitions show up as "Microsoft basic data" type

I have no Microsoft partitions in my system nor dual boot (i run Windows in VirtualBox) yet not sure when this changed (update in November?) all my linux ext4 partitions show up as "Microsoft basic data" types (except BIOS boot and Swap) in fdisk -l (also in Gnome Disk utility gui, just shows "Basic data" instead of the actual Linux type. All the searching in Arch Wiki's I've found refer to dual boot systems so far and haven't turned up anything useful in Google yet either. How to i get this corrected? All drives are GPT:
root@arch-bill /home/bill # fdisk -l
Disk /dev/sdb: 1.8 TiB, 2000398934016 bytes, 3907029168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: gpt
Disk identifier: 0645408C-0374-4357-8663-D2A3512E07BD
Device Start End Size Type
/dev/sdb1 2048 6143 2M BIOS boot partition
/dev/sdb2 8192 8396799 4G Microsoft basic data
/dev/sdb3 8398848 41953279 16G Microsoft basic data
/dev/sdb4 41955328 167786495 60G Microsoft basic data
/dev/sdb6 167788544 3902834687 1.8T Microsoft basic data
Disk /dev/sda: 931.5 GiB, 1000204886016 bytes, 1953525168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: gpt
Disk identifier: C3E095E9-90D9-4BFA-A97F-5D74E64FC4A4
Device Start End Size Type
/dev/sda1 8192 32776191 15.6G Microsoft basic data
/dev/sda2 32778240 1953509375 915.9G Microsoft basic data
/dev/sda3 2048 6143 2M BIOS boot partition
Disk /dev/sdc: 298.1 GiB, 320072933376 bytes, 625142448 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 5607E1F7-1A96-4EF5-A353-29BE91873431
Device Start End Size Type
/dev/sdc1 2048 6293503 3G Linux swap
/dev/sdc2 6295552 618600447 292G Microsoft basic data
Last edited by jasonwryan (2014-12-17 02:22:31)

I followed the instructions here and now fdisk -l reports them correctly (8300 Linux File System, not 0700 Microsoft basic data) - SOLVED
1 root@arch-bill /home/bill # gdisk /dev/sdb :(
GPT fdisk (gdisk) version 0.8.10
Partition table scan:
MBR: protective
BSD: not present
APM: not present
GPT: present
Found valid GPT with protective MBR; using GPT.
Command (? for help): t
Partition number (1-6): 2
Current type is 'Microsoft basic data'
Hex code or GUID (L to show codes, Enter = 8300):
Changed type of partition to 'Linux filesystem'
Command (? for help): t
Partition number (1-6): 3
Current type is 'Microsoft basic data'
Hex code or GUID (L to show codes, Enter = 8300):
Changed type of partition to 'Linux filesystem'
Command (? for help): t
Partition number (1-6): 4
Current type is 'Microsoft basic data'
Hex code or GUID (L to show codes, Enter = 8300):
Changed type of partition to 'Linux filesystem'
Command (? for help): t
Partition number (1-6): 6
Current type is 'Microsoft basic data'
Hex code or GUID (L to show codes, Enter = 8300):
Changed type of partition to 'Linux filesystem'
Command (? for help): p
Disk /dev/sdb: 3907029168 sectors, 1.8 TiB
Logical sector size: 512 bytes
Disk identifier (GUID): 0645408C-0374-4357-8663-D2A3512E07BD
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 3907029134
Partitions will be aligned on 2048-sector boundaries
Total free space is 4204653 sectors (2.0 GiB)
Number Start (sector) End (sector) Size Code Name
1 2048 6143 2.0 MiB EF02
2 8192 8396799 4.0 GiB 8300
3 8398848 41953279 16.0 GiB 8300
4 41955328 167786495 60.0 GiB 8300
6 167788544 3902834687 1.7 TiB 8300
Command (? for help): w
Final checks complete. About to write GPT data. THIS WILL OVERWRITE EXISTING
PARTITIONS!!
Do you want to proceed? (Y/N): Y
OK; writing new GUID partition table (GPT) to /dev/sdb.
The operation has completed successfully.
1 root@arch-bill /home/bill # fdisk -l :(
Disk /dev/sdb: 1.8 TiB, 2000398934016 bytes, 3907029168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: gpt
Disk identifier: 0645408C-0374-4357-8663-D2A3512E07BD
Device Start End Size Type
/dev/sdb1 2048 6143 2M BIOS boot partition
/dev/sdb2 8192 8396799 4G Linux filesystem
/dev/sdb3 8398848 41953279 16G Linux filesystem
/dev/sdb4 41955328 167786495 60G Linux filesystem
/dev/sdb6 167788544 3902834687 1.8T Linux filesystem
Disk /dev/sdc: 298.1 GiB, 320072933376 bytes, 625142448 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 5607E1F7-1A96-4EF5-A353-29BE91873431
Device Start End Size Type
/dev/sdc1 2048 6293503 3G Linux swap
/dev/sdc2 6295552 618600447 292G Microsoft basic data
Disk /dev/sda: 931.5 GiB, 1000204886016 bytes, 1953525168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: gpt
Disk identifier: C3E095E9-90D9-4BFA-A97F-5D74E64FC4A4
Device Start End Size Type
/dev/sda1 8192 32776191 15.6G Microsoft basic data
/dev/sda2 32778240 1953509375 915.9G Microsoft basic data
/dev/sda3 2048 6143 2M BIOS boot partition
root@arch-bill /home/bill #

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