I've just installed Ubuntu 10.04 after Mandriva on an external HD.

I have 8 OS's altogether and Grub handles the rest fine - but Mandriva wont list properly!!!

I've already tried the Super Grub Disc - to no avail.

I know that I just need to tweak a Grub file somewhere - but which one???

Any ideas?

Usually it's /boot/grub/grub.conf that you need

Who's GRUB are you using ?
Ubuntu 10.4 standard use GRUB 2 unless you change it
Other distros are still using GRUB 1
Adding it to the menu.lst or GRUB.cfg (GRUB 2) differs .
So with GRUB are you using.

Definitely Grub2

Have a read of this.

Thanks for the link - I'll let you know what happens!

Here's what finally worked:


I got the correct address from GParted as OS-Prober produced something totally confusing - there is no device.map file and my second drive changed to sdb after the first edit??? - I took out the “hd’s” - and just as I was getting ready to give up and shut down for the night Mandriva booted.

After numerous re-edits this is what finally worked so many thanks Old Fred.

menuentry "Mandriva 2010 (on /dev/sdb2)" {
insmod ext4
set root=
search --no-floppy --fs-uuid --set 9b8a9870-e1e0-4408-b694-465a3464744a
linux /boot/vmlinuz BOOT_IMAGE=linux root=LABEL=MANDRIVA root=UUID=9b8a9870-e1e0-4408-b694-465a3464744a splash=silent vga=788
initrd /boot/initrd.img
}


Where as what os-prober produces is:

menuentry "linux (on /dev/sdb2)" {
insmod ext2
set root='(hd1,2)'
search --no-floppy --fs-uuid --set 9b8a9870-e1e0-4408-b694-465a3464744a
linux /boot/vmlinuz BOOT_IMAGE=linux root=LABEL=MANDRIVA resume=UUID=81917bd1-ae88-4519-8774-345c41958c76 splash=silent vga=788
initrd (hd1,1)/boot/initrd.img
}
menuentry "linux-nonfb (on /dev/sdb2)" {
insmod ext2
set root='(hd1,2)'
search --no-floppy --fs-uuid --set 9b8a9870-e1e0-4408-b694-465a3464744a
linux /boot/vmlinuz BOOT_IMAGE=linux-nonfb root=LABEL=MANDRIVA resume=UUID=81917bd1-ae88-4519-8774-345c41958c76
initrd (hd1,1)/boot/initrd.img
}
menuentry "failsafe (on /dev/sdb2)" {
insmod ext2
set root='(hd1,2)'
search --no-floppy --fs-uuid --set 9b8a9870-e1e0-4408-b694-465a3464744a
linux /boot/vmlinuz BOOT_IMAGE=failsafe root=LABEL=MANDRIVA failsafe
initrd (hd1,1)/boot/initrd.img
}


I shall follow the rest of their advice and tidy up my boot menu and disable os-prober!!!