[Bug 997414] Re: Kubuntu 11.10 with encrypted root upgraded to 12.04 result in unbootable system due to Grub limitations

[Bart Cerneels]

Just experienced the same problem after a 11.10 -> 12.04 update. The
11.10 install was also kubuntu, but don't think it matters.

Disk partitioned as:
(parted) p                                                                
Model: ATA HITACHI HTS72323 (scsi)
Disk /dev/sda: 320GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos

Number  Start   End    Size   Type      File system  Flags
 1      1049kB  256MB  255MB  primary   ext2
 2      257MB   320GB  320GB  extended
 5      257MB   320GB  320GB  logical

with 5 being a LUKS encrypted LVM setup:
root at ubuntu:/# lvdisplay 
  --- Logical volume ---
  LV Name                /dev/cox/root
  VG Name                cox
  LV UUID                VRCA0x-HQKI-poSW-2i3E-ECBa-HpR7-xiSREw
  LV Write Access        read/write
  LV Status              available
  # open                 0
  LV Size                292.49 GiB
  Current LE             74878
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           252:1
   
  --- Logical volume ---
  LV Name                /dev/cox/swap_1
  VG Name                cox
  LV UUID                tRQYQV-Vz8s-gZAF-3M4V-fHtF-aeml-fZhMcj
  LV Write Access        read/write
  LV Status              NOT available
  LV Size                5.34 GiB
  Current LE             1368
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto

I'll try the fix from #1

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https://bugs.launchpad.net/bugs/997414

Title:
  Kubuntu 11.10 with encrypted root upgraded to 12.04 result in
  unbootable system due to Grub limitations

Status in “grub2” package in Ubuntu:
  Incomplete

Bug description:
  I have perfectly working Kubuntu 11.10 system. The machine is Dell Precision T5500 with the following disks
  /dev/sda 164 GB
  - dev/sda1 - primary - Windows XP
  /dev/sdb 1TB
  - /dev/sdb1 - primary - Windows 7 system partition
  - /dev/sdb2 - primary - WIndows 7 OS
  - /dev/sdb3 - primary - Kubuntu 11.10 /boot partition
  - /dev/sdb4 - extended partition
  - /dev/sdb5 - logical LUKS encryption partition mapped to / (root)
  - /dev/sdb6 - logical LUKS encrypted partition swap

  After online upgrade to 12.04 which went without any issues I rebooted the system. I was presented with GRUB menu which correctly listed
  - Ubuntu 12.04 with latest 3.x server
  - Previous Kernel versions
  - Window 7
  - Windows XP

  Regardless with option I choose I receive 3 errors
  - no such partition
  If I drop to Grub console and I try to do ls I receive error
  - no such partition

  When I reboot to Ubuntu or Kubuntu alternative CD and try to do rescue
  It correctly detects all my partitions, asks for passwords for /dev/sdb5 and /dev/sdb6 and unlocks them
  If I try to to grub reinstall I receive error it cannot reinstall it
  If I try to chroot to /dev/mapper/sdb5_crypt I get a working shell
  If I try to do grub-install I get error that is cannot find mapping for /dev/mapper/sdb5_crypt to GRUB DISK
  If I try to do grub-probe as suggested by grub-update I get error that it cannot find mapping for /dev/mapper/sdb5_crypt and to check my device.map file
  If I try to run grub-devicemap it maps only /dev/sda and /dev/sdb but not /dev/mapper/sdb5_crypt
  If I try to modify device.map file manually it doesn't work
  If I try to do update-grub I get reference that GRUB doesn't understand LUKS encrypted volumes and look at bug http://bugs.debian.org/491977. It also creates new grub.cfg file which has only entry for Windows XP and WIndows 7 but not to the current Linux installation I am actively using

  At the end I am unable to fix the system since grub doesn't allow me
  to update the boot sector to bootable system. I had to reinstall.

  I have also logged it as  
  https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/997407
  since it happened during upgrade but logging it also specifically against GRUB since it seems to be limitation of GRUB in 12.04 resulting in unbootable system

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