This sounds like an initramfs-tools problem. Run this: sudo update-initramfs -u Then try rebooting. ** Changed in: linux-source-2.6.15 (Ubuntu) Sourcepackagename: linux-source-2.6.15 => initramfs-tools Binarypackagename: linux-source-2.6.15 => None -- Kernel panic on powerpc https://launchpad.net/malone/bugs/37405