Public bug reported:

1) Release: Freshly upgraded from 8.04 to 8.10 via GUI Update Manager
2) Package version: Unknown package
3) Expected: system to boot normally immediately after upgrade, as it always 
did before the upgrade
4) What happened: Quoting from my posts on ubuntuforums.org on this topic:
"/boot is on its own ext2 partition
/ is on a 3-disk raid5, md0, xfs
/home is on a 3-disk raid5, md1, xfs (same 3 disks, different member partitions)
swap partitions on each of the same 3 disks
I have a fourth disk with a couple partitions acting as hot spares for md0 and 
md1

When I try to boot the system normally from the hdd, I get a maintenance
shell and some errors, all indicating that / is read-only. It tells me
to manually check my fs for errors, but 'xfs_repair -d /dev/md0' fails.
'xfs_repair -L /dev/md0' should kill the fs jounral, but that also
fails.

'mount -o remount,rw /' gives some error (I don't have access to this
machine at the moment), and / is still mounted ro. If I do a 'mount' it
shows that / is mounted rw, probably because mtab is not writable. 'cat
/proc/mdstat' shows that my raids are healthy.

So unable to get past my maintenance shell, I saved dmesg to a writable
partition and booted from a live cd. I used 'mdadm -A /dev/md0' to
assemble my array and then ran 'xfs_repair -d /dev/md0'. It made some
repairs, I rebooted from the hdd, but / is still ro.

I go back to the live cd, assemble the array, and rerun 'xfs_repair -d
/dev/md0' but no errors this time. I try 'xfs_repair -L /dev/md0' to
kill the journal, reboot from the hdd, and still / is ro."

lspci -vvnn is here: http://launchpadlibrarian.net/14057715/lspci
partial dmesg and other related info is here: 
http://ubuntuforums.org/showpost.php?p=6280024&postcount=2

db

** Affects: ubuntu
     Importance: Undecided
         Status: New

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/ partition is read-only after upgrading 8.04 -> 8.10
https://bugs.launchpad.net/bugs/304298
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