Comment 1 for bug 190588

Possible similar bug here, after linux-header 2.6.22-14-generic upgrade on 5th February 2008 boot stops with Busybox message
Begin: waiting for root file system
check root=bootarg cat /proc/cmdline
or missing modules,devices: cat /proc/modules ls /dev
Alert /dev/disk/by UUID/"xxxxxxxxxxxxxxxxxxxxxxxxxx"
does not exist. Dropping to shell

Busy Box V1.13
(initramfs)

Still able to use grub to boot with 2.6.20-16-generic
No abnormal UUID identified in Grub. Reinstalling headers doesn't cure boot error.

Asrock 939 Dual-VSTA Athlon 64 x2 Dual core nVidia 6600gt IDE primary master with 32 bit, SATA11 with 64 bit Ubuntu with a grub was also powered during the header upgrade.

$ cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=7.10
DISTRIB_CODENAME=gutsy
DISTRIB_DESCRIPTION="Ubuntu 7.10"