Same for some other upgrades (most from 10.10, one from 9.04): upgrading grub 
fails if the device has an unconventional name. It is fixed for /dev/sd*, 
/dev/hd* and /dev/vd*, but not for /dev/*
The update script does only accept some devices as boot devices, but not any 
combination allowed by the file system. As soon as there are uncommon device 
names, the routine will fail, leaving the user with an upgraded grub, but a non 
booting system!

Workaround: do not select "boot automatically" after upgrading, then
install-grub /dev/your_uncommon_boot_device_name

for sure recreate grub.cfg:
update-grub

then reboot:
reboot

At least for me it was fine, to have a rescue cd at hand with grub
installed on it. In most cases I could start the system this way, then
repair grub to make it boot again!

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https://bugs.launchpad.net/bugs/754563

Title:
  After upgrading from 10.10 to 11.04 system doesn't start

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