Booted to lucid (the one from comment #110 that showed no errors. Install portmap & repeated the test on that machine:
$ dmesg | grep orphan [ 3.676128] EXT4-fs (sdb1): orphan cleanup on readonly fs [ 3.676159] EXT4-fs (sdb1): ext4_orphan_cleanup: deleting unreferenced inode 193222 [ 3.676396] EXT4-fs (sdb1): 1 orphan inode deleted So that machine is now showing an orphan. lucid@lucid-desktop:~$ apt-cache policy portmap portmap: Installed: 6.0.0-1ubuntu2.1 Candidate: 6.0.0-1ubuntu2.1 Version table: *** 6.0.0-1ubuntu2.1 0 500 http://archive.ubuntu.com/ubuntu/ lucid-updates/main Packages 100 /var/lib/dpkg/status 6.0.0-1ubuntu2 0 500 http://archive.ubuntu.com/ubuntu/ lucid/main Packages -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/672177 Title: libc6 upgrade causes umount to fail on shutdown because init cannot be restarted -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs