Further to my post earlier on https://www.wilderssecurity.com/showpost.php?p=2148283&postcount=1 I have done an upgrade from Kubuntu 12.04 to 12.10 on sdb (the OS from which I boot everything is Kubuntu 12.04 on sda). The upgrade itself went smoothly but here's the crunch. I am getting the 12.04 splash and am booting into the 12.04 kernel, although I am running 12.10 and have the 3.5x kernel installed. severin@severin-desktop:~$ uname -a Linux severin-desktop 3.2.0-33-generic #52-Ubuntu SMP Thu Oct 18 16:29:15 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux severin@severin-desktop:~$ cat /etc/lsb-release DISTRIB_ID=Ubuntu DISTRIB_RELEASE=12.10 DISTRIB_CODENAME=quantal DISTRIB_DESCRIPTION="Ubuntu 12.10" severin@severin-desktop:~$ severin@severin-desktop:~$ sudo grub-install --force /dev/sdb1 /usr/sbin/grub-bios-setup: warning: File system `ext2' doesn't support embedding. /usr/sbin/grub-bios-setup: warning: Embedding is not possible. GRUB can only be installed in this setup by using blocklists. However, blocklists are UNRELIABLE and their use is discouraged.. Installation finished. No error reported. severin@severin-desktop:~$ sudo update-grub Generating grub.cfg ... Found linux image: /boot/vmlinuz-3.5.0-18-generic Found initrd image: /boot/initrd.img-3.5.0-18-generic Found linux image: /boot/vmlinuz-3.2.0-33-generic Found initrd image: /boot/initrd.img-3.2.0-33-generic Found memtest86+ image: /boot/memtest86+.bin Found Ubuntu 12.04.1 LTS (12.04) on /dev/sda1 Found Scientific Linux release 6.3 (Carbon) on /dev/sdb5 done severin@severin-desktop:~$ Even after disabling OS prober there is no change. This seems to be a big problem with multiboot setups as borne out by this thread ... http://ubuntuforums.org/showthread.php?t=2065520&highlight=grub2 lubuntu Any ideas ? For some reason 12.10 is using the 1.99 grub of 12.04. => Grub2 (v1.99) is installed in the MBR of /dev/sda and looks at sector 1 of the same hard drive for core.img. core.img is at this location and looks for (,msdos1)/boot/grub on this drive. => Grub2 (v1.99) is installed in the MBR of /dev/sdb and looks at sector 1 of the same hard drive for core.img. core.img is at this location and looks for (,msdos1)/boot/grub on this drive.