Comment 61 for bug 536673

Here is the additional information:

"mount" reports:

ubuntu@ubuntu:~$ mount
aufs on / type aufs (rw)
none on /proc type proc (rw,noexec,nosuid,nodev)
none on /sys type sysfs (rw,noexec,nosuid,nodev)
none on /dev type devtmpfs (rw,mode=0755)
none on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=0620)
/dev/sr0 on /cdrom type iso9660 (ro,noatime)
/dev/loop0 on /rofs type squashfs (ro,noatime)
none on /sys/fs/fuse/connections type fusectl (rw)
none on /sys/kernel/debug type debugfs (rw)
none on /sys/kernel/security type securityfs (rw)
none on /dev/shm type tmpfs (rw,nosuid,nodev)
tmpfs on /tmp type tmpfs (rw,nosuid,nodev)
none on /var/run type tmpfs (rw,nosuid,mode=0755)
none on /var/lock type tmpfs (rw,noexec,nosuid,nodev)
none on /lib/init/rw type tmpfs (rw,nosuid,mode=0755)
binfmt_misc on /proc/sys/fs/binfmt_misc type binfmt_misc (rw,noexec,nosuid,nodev)
gvfs-fuse-daemon on /home/ubuntu/.gvfs type fuse.gvfs-fuse-daemon (rw,nosuid,nodev,user=ubuntu)
/dev/sda1 on /mnt/migrationassistant type ext3 (rw)

ubuntu@ubuntu:~$ sudo lsof /mnt/migrationassistant/
lsof: WARNING: can't stat() tmpfs file system /cow
      Output information may be incomplete.
lsof: WARNING: can't stat() fuse.gvfs-fuse-daemon file system /home/ubuntu/.gvfs
      Output information may be incomplete.
ubuntu@ubuntu:~$

The "failed to unmount partitions" message says that the the problem mount point is:

/mnt/migrationassistant/home

When I say I would like the installer to try to unmount these partitions again, it crashed this time.

Here's the lsof output for that directory:

ubuntu@ubuntu:~$ lsof /mnt/migrationassistant/home
lsof: WARNING: can't stat() tmpfs file system /cow
      Output information may be incomplete.
ubuntu@ubuntu:~$

The system installed on /dev/sda1 has a separate /home partition. I wonder if this is part of what's causing the problem?

I'll be unavailable for further testing for about the next five hours or so. (Meetings and things)