Comment 53 for bug 653134

I installed a fresh 10.10 Maverick using Wubi. Then I went into synaptic and reinstalled grub-pc. This is the diff file from grub.cfg before reinstalling and after.
35,36d34
< insmod vbe
< insmod vga
39,59d36
< insmod part_msdos
< insmod ntfs
< set root='(hd0,msdos2)'
< search --no-floppy --fs-uuid --set 80e4e195e4e18daa
< loopback loop0 /ubuntu/disks/root.disk
< set root=(loop0)
< if loadfont /usr/share/grub/unicode.pf2 ; then
< set gfxmode=640x480
< load_video
< insmod gfxterm
< fi
< terminal_output gfxterm
< insmod part_msdos
< insmod ntfs
< set root='(hd0,msdos2)'
< search --no-floppy --fs-uuid --set 80e4e195e4e18daa
< loopback loop0 /ubuntu/disks/root.disk
< set root=(loop0)
< set locale_dir=($root)/boot/grub/locale
< set lang=en
< insmod gettext
140,155d116
< }

So... this is probably the root cause of the issue. I've been seeing reports on ubuntuforums.org that commenting out the loopback lines (the two in the diff shown above) gets wubi booting. But surely the cause is that all these lines are different between the base install, and reinstalling grub-pc i.e. one of the scripts in /etc/grub.d is being changed from the default install.

This is likely also the problem then with the 10.04.1 installs that are breaking.