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Old 06-26-2014, 09:08 AM   #1
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Question Xubuntu - Boot from Windows 7 with GPT


I have Slackware with dual boot using bcdedit...

Can I boot my xubuntu with bcdedit using GPT partition?

Last edited by mobjr; 06-26-2014 at 09:11 AM.
Old 06-27-2014, 08:21 AM   #2
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Are you booting Slackware with this method with GPT? I would think you would just need to repeat the process you used for Slackware for Xubuntu. Seems like a convoluted method but I suppose there are situations when it is best.
Old 06-27-2014, 03:07 PM   #3
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Unfortunately no.

I have MBR using Slackware with my PC and my Note GPT using Xubuntu.

I can boot my Slack with "lilo" and "Windows boot"(Boot from Windows)
I need to pass -P ignore to install lilo because Windows change my sector size.
Disk /dev/sda: 1000.2 GB, 1000204886016 bytes
1 heads, 2 sectors/track, 976762584 cylinders, total 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
Disk identifier: 0xdaf99b34

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048   419432447   209715200    7  HPFS/NTFS/exFAT
/dev/sda2       419432448  1468008447   524288000    5  Extended
/dev/sda5       419434496  1048580095   314572800    7  HPFS/NTFS/exFAT
/dev/sda6   *  1048582144  1258297343   104857600   83  Linux
/dev/sda7      1258299392  1468006399   104853504   83  Linux
My Note I use grub2 and EFI.

GPT fdisk (gdisk) version 0.8.8

Partition table scan:
  MBR: protective
  BSD: not present
  APM: not present
  GPT: present

Found valid GPT with protective MBR; using GPT.
Disk /dev/sda: 1953525168 sectors, 931.5 GiB
Logical sector size: 512 bytes
Disk identifier (GUID): 67DF012A-57E4-4348-B881-497D428A17C0
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 1953525134
Partitions will be aligned on 2048-sector boundaries
Total free space is 341611885 sectors (162.9 GiB)

Number  Start (sector)    End (sector)  Size       Code  Name
   1            2048          206847   100.0 MiB   EF00  EFI system partition
   2          206848          468991   128.0 MiB   0C01  Microsoft reserved part
   3          468992       409602047   195.1 GiB   0700  Basic data partition
   4       409602048       410578943   477.0 MiB   EF02  
   5       410578944       411578367   488.0 MiB   8200  
   6       411578368       606889983   93.1 GiB    8300  
   7       606889984       997515263   186.3 GiB   8300  
   8       997515264      1611915263   293.0 GiB   0700  Basic data partition
Is possible to copy the first 512 bytes from GPT partition(4 EF02)?
If yes I think I can boot Xubuntu from windows using bcdedit.
Old 06-27-2014, 06:27 PM   #4
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No - UEFI boots completely differently.

I don't have Win7 on gpt disk, but I'd expect grub2 to find it and add a Win7 entry to the boot list - I'd suggest you use grub2 as the default firmware load.

To modify the firmware boot menu, install efibootmgr from Intel - should be in the Xubuntu repos (Mint has it) - comes with good help.


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