Thanks for the http://sourceforge.net/projects/bootinfoscript/
suggestion.
Today I made quite few experiments, and the result in brief is:
no reboot problem after "dpkg-reconfigure grub-pc" and neither after the
other two boot-tampering, in the 3 cases below:
/boot/ tree is in a separated ext4 filesystem, root is xfs
/boot/ tree is in a separated xfs filesystem, root is xfs
/boot/ tree is in the root filesystem, which is ext4
deterministically appearing reboot problem in the original case:
/boot/ tree is in the root filesystem, which is xfs
However I can not predict the prospective reboot error, today I saw
additional 2 new kind of error messeges:
"error: attempt to read or write outside of partition."
"error: file `/boot/grub/i386-pc/normal.mod' not found."
At grub rescue prompt the command "ls /boot/grub/i386-pc/normal.mod"
tend to give various error messages, like
"error: not a correct XFS node."
sometimes even the /boot/grub appears to be empty, or one can see the
entry i386-pc in it, but it can't be listed by ls /boot/grub/i386-pc,
and so on.
While at the earlier missing initrd.img problem I could boot by hand,
this reboot error gives no opportunity to boot by hand.
However if I boot by SYSRESCCD, and I do nothing else (or work for a
while) and I reboot, than this second reboot is guaranted to be
successful.
SYSRESCCD I think does not tamper the boot system, at least the
bootinfoscript has an identical output before the unsuccessful boot, and
after the successful boot.
Now I try to attach the 4 results.txt files, corresponding the 4 cases,
according to whether the /boot/ tree is in separate partition, and
whether the partition containing the /boot/ tree is xfs or ext4.
Comment: for testing the case of when /boot is in the root partition of
type ext4, I installed a new Ubuntu on an other drive replaced into my
linux box.
** Attachment added: "tar bzip2 of the 4 RESULTS.txt"
https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1103187/+attachment/3499254/+files/results.tbz
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https://bugs.launchpad.net/bugs/1103187
Title:
automatic updates tend to reboot and die into grub rescue
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