[Bug 1094247] Re: Boot problem with Xen DomU after kernel upgrade

[Olli]

Forget about my last comment. The bracket is correct. Just remove the
submenu entry in grub.cfg an the DomU will boot again.

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Title:
  Boot problem with Xen DomU after kernel upgrade

Status in “grub” package in Ubuntu:
  Confirmed

Bug description:
  Setting:

  - Xen Dom0 running Ubuntu Server 12.04
  - Xen DomU running Ubuntu Server 12.04

  $ lsb_release -rd
  Description:	Ubuntu 12.04.1 LTS
  Release:	12.04

  $ apt-cache policy grub2-common
  grub2-common:
    Installed: 1.99-21ubuntu3.4
    Candidate: 1.99-21ubuntu3.4
    Version table:
   *** 1.99-21ubuntu3.4 0
          500 http://de.archive.ubuntu.com/ubuntu/ precise-updates/main amd64 Packages
          100 /var/lib/dpkg/status
       1.99-21ubuntu3 0
          500 http://de.archive.ubuntu.com/ubuntu/ precise/main amd64 Packages

  $ apt-cache policy xen-utils-4.1 
  xen-utils-4.1:
    Installiert: 4.1.2-2ubuntu2.4
    Kandidat:    4.1.2-2ubuntu2.4
    Versionstabelle:
   *** 4.1.2-2ubuntu2.4 0
          500 http://de.archive.ubuntu.com/ubuntu/ precise-updates/universe amd64 Packages
          500 http://security.ubuntu.com/ubuntu/ precise-security/universe amd64 Packages
          100 /var/lib/dpkg/status
       4.1.2-2ubuntu2 0
          500 http://de.archive.ubuntu.com/ubuntu/ precise/universe amd64 Packages

  
  DomU was installed with Netboot-Image on a LVM volume. Bootloader than changed to pygrub.

  --- Xen configuration for machine ---
  name = "openldaptest"
  memory = 256
  disk = ['phy:/dev/camion/openldaptest,xvda,w']
  vif = ['bridge=xenbr0']
  bootloader = "pygrub"
  ---

  Did `apt-get dist-upgrade` inside the DomU with kernel upgrade and
  after `init 6` the DomU would not boot anymore.

  Starting pygrub manually:

      $ sudo /usr/bin/pygrub -n /dev/camion/openldaptest
      Using <class 'grub.GrubConf.Grub2ConfigFile'> to parse
      /boot/grub/grub.cfg
      WARNING:root:Unknown directive load_video
      WARNING:root:Unknown directive terminal_output
      WARNING:root:Unknown directive else
      WARNING:root:Unknown directive else
      WARNING:root:Unknown directive else
      WARNING:root:Unknown directive else
      WARNING:root:Unknown directive else
      WARNING:root:Unknown directive export
      WARNING:root:Unknown image directive recordfail
      WARNING:root:Unknown image directive gfxmode
      WARNING:root:Unknown image directive recordfail
      WARNING:root:Unknown directive submenu
      WARNING:root:Unknown image directive recordfail
      WARNING:root:Unknown image directive gfxmode
      WARNING:root:Unknown image directive recordfail
      Traceback (most recent call last):
        File "/usr/bin/pygrub", line 763, in <module>
          raise RuntimeError, "Unable to find partition containing kernel"
      RuntimeError: Unable to find partition containing kernel

  The message 'Unknown directive submenu' was the first different from a
  working DomU.

  So I mounted the the system partition, copied a backup over
  /boot/grub/grub.cfg and manually changed it to the version of the new
  kernel on all occurences of the version number. After that I unmounted
  the system partition and could start the DomU again. I then did login
  on the DomU and removed the old kernel with `apt-get purge`. This time
  after `init 6` the DomU booted fine.

  So after all it is working but the process of upgrading the kernel is
  suboptimal.

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