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This is a 5-boot setup.

Upgrade to 9.10 showed/listed in GRUB2 all 5 OS's. 2 Linux's won't boot. 9.10, XP, Vista boot ok...

Edit:
ls (hd0,4) /boot returned
Partition hd0,4: fs ext2, Label /,...

Neither worked...

Tried without the line at all, and tried with just
search --no-floppy --label --set /dev/sda4

Both gave same result as default result

VFS: Cannot open root device "sda4"...

menuentry "Ubuntu, Linux 2.6.31-12-generic (recovery mode)" {
recordfail=1
save_env recordfail
insmod ext2
set root=(hd0,1)
search --no-floppy --fs-uuid --set...