TEST CASE:

Environment:

VM with virtio boot disk /dev/vda partition (like /dev/vda1) mounted on
/ possibly also a partition (like /dev/vda1) on mounted on /boot and no
/dev/disk/by-id directory (because of missing udev rules.)

Example Environment:

$ ls /dev/[shv]d*
/dev/vda  /dev/vda1  /dev/vda2
$ ls -ld /dev/disk/by-id
ls: cannot access /dev/disk/by-id: No such file or directory

Run:

sudo dpkg-reconfigure grub-pc

If you get these error messages:

``You chose not to install GRUB to any devices.  If you continue, the
boot loader may not be properly configured, and when your computer next
starts up it will use whatever was previously in the boot sector.  If
there is an earlier version of GRUB 2 in the boot sector, it may be
unable to load modules or handle the current  configuration file.

If you are already running a different boot loader and want to carry on
doing so, or if this is a special environment where you do not need a
boot loader, then you should continue anyway.  Otherwise, you should
install GRUB somewhere.

Continue without installing GRUB?''

Then the bug this ticket (LP: #604335) is about is present.

If you get

$ ls -ld /dev/disk/by-id
drwxr-xr-x 2 root root 120 2011-06-09 16:00 /dev/disk/by-id

Plus when you run "sudo dpkg-reconfigure grub-pc" you see /dev/vda and
/dev/vda1 offered as targets for installing grub2 into and do not get
the above error messages then you do not have the bug.

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https://bugs.launchpad.net/bugs/604335

Title:
  grub-pc.postinst script fails to detect virtio vda disk in KVM guest

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