[Bug 960092] Re: Latest update renders system unbootable "error: no such partition"

[Alan Pope]

My partition layout is based on two disks. One SSD for / and swap, one
large hard disk for /home.

alan at wopr:~$ sudo fdisk -l
[sudo] password for alan: 

Disk /dev/sda: 1000 GB, 1000202273280 bytes
255 heads, 63 sectors/track, 121601 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System 
/dev/sda1   *           1      121602   976768033   83  Linux
Warning: Partition 1 does not end on cylinder boundary.

Disk /dev/sdb: 120 GB, 120031511040 bytes
255 heads, 63 sectors/track, 14593 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System 
/dev/sdb1   *           1       13995   112414806   83  Linux
Warning: Partition 1 does not end on cylinder boundary.
/dev/sdb2           13995       14594     4811467    5  Extended
Warning: Partition 2 does not end on cylinder boundary.
/dev/sdb5           13995       14594     4811467   82  Linux swap
Warning: Partition 5 does not end on cylinder boundary.
Warning: Unable to open /dev/sr0 read-write (Read-only file system).  /dev/sr0 has been opened read-only.
Error: /dev/sr0: unrecognised disk label

alan at wopr:~$ mount
/dev/sdb1 on / type ext4 (rw,errors=remount-ro,discard)
proc on /proc type proc (rw,noexec,nosuid,nodev)
sysfs on /sys type sysfs (rw,noexec,nosuid,nodev)
none on /sys/fs/fuse/connections type fusectl (rw)
none on /sys/kernel/debug type debugfs (rw)
none on /sys/kernel/security type securityfs (rw)
udev on /dev type devtmpfs (rw,mode=0755)
devpts on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=0620)
tmpfs on /run type tmpfs (rw,noexec,nosuid,size=10%,mode=0755)
none on /run/lock type tmpfs (rw,noexec,nosuid,nodev,size=5242880)
none on /run/shm type tmpfs (rw,nosuid,nodev)
cgroup on /sys/fs/cgroup type tmpfs (rw,relatime,mode=755)
cgroup on /sys/fs/cgroup/cpuset type cgroup (rw,relatime,cpuset)
cgroup on /sys/fs/cgroup/cpu type cgroup (rw,relatime,cpu)
cgroup on /sys/fs/cgroup/cpuacct type cgroup (rw,relatime,cpuacct)
cgroup on /sys/fs/cgroup/memory type cgroup (rw,relatime,memory)
cgroup on /sys/fs/cgroup/devices type cgroup (rw,relatime,devices)
cgroup on /sys/fs/cgroup/freezer type cgroup (rw,relatime,freezer)
cgroup on /sys/fs/cgroup/blkio type cgroup (rw,relatime,blkio)
cgroup on /sys/fs/cgroup/perf_event type cgroup (rw,relatime,perf_event)
/dev/sda1 on /home type ext4 (rw,user_xattr)
binfmt_misc on /proc/sys/fs/binfmt_misc type binfmt_misc (rw,noexec,nosuid,nodev)
gvfs-fuse-daemon on /home/alan/.cache/gvfs type fuse.gvfs-fuse-daemon (rw,nosuid,nodev,user=alan)
gvfs-fuse-daemon on /tmp/guest-dF1pAM/.cache/gvfs type fuse.gvfs-fuse-daemon (rw,nosuid,nodev,user=guest-dF1pAM)

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https://bugs.launchpad.net/bugs/960092

Title:
  Latest update renders system unbootable "error: no such partition"

Status in “grub2” package in Ubuntu:
  Confirmed

Bug description:
  Just did my daily 12.04 updates and ended up with an unbootable
  system:-

  error: no such partition.
  error: no such partition.
  error: no such partition.

  Press any key to continue...

  I had to chroot into the install to reinstall grub and the kernel to
  get it back to a bootable state.

  See attached photos.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: grub (not installed)
  ProcVersionSignature: Ubuntu 3.2.0-19.30-generic 3.2.11
  Uname: Linux 3.2.0-19-generic x86_64
  ApportVersion: 1.94.1-0ubuntu2
  Architecture: amd64
  Date: Tue Mar 20 11:00:34 2012
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 (20120102)
  SourcePackage: grub
  UpgradeStatus: No upgrade log present (probably fresh install)

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