Public bug reported:
Binary package hint: grub
I just installed Ubuntu Lucid Lynx. At first grub would just hang on
boot, so I decided to do some investigation. With the help of someone in
#grub on irc.freenode.net, I got into a grub console, set the debug=all
flag and was able to track my problem down to the fact that grub hangs
while trying to probe my device drives.
I would boot into the grub console, and type in root (hd0, and then hit
tab for automatic tab completion. Grub would correctly identify (hd0,1)
as ext2 and (hd0,2) as swap. However, on (hd0,5) (which should be ext2),
grub hung.
In the debug trace, the last line had something to do with the zfs module
/build/buildd/grub-1.98/zfs/zfs.c:2001: label 1 ok
/build/buildd/grub-1.98/zfs/zfs.c:2006: No uberblock found
So, with the guidance of #grub, I renamed the zfs.mod and zfsinfo.mod in
the /boot/grub directory to zfs.mod-bak and zfsinfo.mod-bak,
respectively. Once again I rebooted into the shell and tried the tab
completion, with the debug trace on. This time grub correctly reported
(hd0,5) as ext2, but failed on (hd0,2), giving the error file not found.
However, that error did not hang the system. Instead, grub hung this
time with something to do with the partition table on (hd0,3) (which is
an extended partition). I'm attaching a screenshot of the problem, this
time.
I'm not sure whether it's a bug in grub or a bug in ubuntu, since ubuntu
uses a modified grub version (vanilla grub doesn't support zfs, afaik)
I'll provide any needed info and am willing to do hacking on grub to get
this fixed. I have a good amount of experience in OS development.
Once again
** Affects: grub (Ubuntu)
Importance: Undecided
Status: New
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GRUB2 hangs on boot
https://bugs.launchpad.net/bugs/613720
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