I made these simple changes to my Lucid Grub 2 bootloader and am now a very happy Ubuntu dual booter. i mainly wanted to see the splash image I had for Karmic plus a descriptive boot menu entry. This is of course not possible when using the OS prober, which I disabled for good measure. Bootable rescue CD works fine as usual. (..Karmic is on my second SATA drive i.e. sdb with Grub installed to / partition boot sector, hence (hd1,1) ....) Changes made to Lucid (17-5-2010) In /etc/grub.d 40_custom added: echo "Adding custom boot entry(s)" >&2 (Edit: Not needed) cat << EOF menuentry "Ubuntu Karmic 9.10" { set root=(hd1,1) chainloader +1 } EOF *************************************************************************** Add to etc/default/grub GRUB_DISABLE_OS_PROBER=true (under GRUB_COMMANDLINE_LINUX="") and.. (Edit: If you have this situation:- Bootup/Plymouth. Users should experience a much faster boot however some users may experience problems with Plymouth after the nVidia graphics driver has been enabled. Users may experience plymouth using lower graphics resolution.) # The resolution used on graphical terminal # note that you can use only modes which your graphic card supports via VBE # you can see them in real GRUB with the command `vbeinfo' #GRUB_GFXMODE=640x480 GRUB_GFXPAYLOAD_LINUX=1440x900 **** Save the file and run sudo update-grub **** I added this line. (Should be your monitors native resolution) For Windows/Ubuntu dual booters this seems to be the way to go nowadays:- http://sourceforge.net/apps/mediawiki/bootinfoscript/index.php?title=Boot_Problems:Boot_Sector