I was performing a distribution upgrade from Lucid to Precise and was unable to boot after the upgrade. Coming to find out this was due to my menu.lst missing an intird line. I had the following:
I manually added in the initrd line and was able to boot. I also reinstalled the linux-image package and the initrd line was created for the recovery boot option. From what I could see in the apt-term.log file update-grub was run one time halfway through the upgrade and update-initramfs was run at the very end. So I'm guessing because there wasn't an initrd available it wasn't added to menu.lst.
I was performing a distribution upgrade from Lucid to Precise and was unable to boot after the upgrade. Coming to find out this was due to my menu.lst missing an intird line. I had the following:
title Ubuntu precise (development branch), kernel 3.2.0-18-generic 3.2.0-18- generic root=/dev/md0 ro quiet splash
root (hd0,0)
kernel /boot/vmlinuz-
quiet
I manually added in the initrd line and was able to boot. I also reinstalled the linux-image package and the initrd line was created for the recovery boot option. From what I could see in the apt-term.log file update-grub was run one time halfway through the upgrade and update-initramfs was run at the very end. So I'm guessing because there wasn't an initrd available it wasn't added to menu.lst.