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[Robert Hardy <1460794@xxxxxxxxxxxxxxxxxx>]

I dug into this more on the server that failed to upgrade properly to
see if the server would work properly after switching back to systemd.
Please recall this was after a backup and restore with a much simpler
partitioning scheme. It still would not boot.

I ended up finding this line in my fstab:
cgroup                /dev/cgroup     cgroup  defaults         0       0

This was not a line I added. I believe it may be a remenant from an old release which the upgrader did not comment out.
The server began its life with Ubuntu 10.04. 

Once I commented that cgroup line out the system booted with systemd in
place. Since I doubt this will ever get to a complete state please close
the bug.

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Touch seeded packages, which is subscribed to systemd in Ubuntu.
https://bugs.launchpad.net/bugs/1460794

Title:
  systemd does not boot with a separate /usr partition

Status in systemd package in Ubuntu:
  Incomplete

Bug description:
  I recently upgraded a server from 14.10 to 15.04. The upgrade claim to
  have worked but the system could not boot afterwards.

  Basically when you attempt to reboot you end up at an emergency maintenance prompt early in the boot process.
  After a lot of digging one of the messages in the logs gives:
  systemd[1]: /usr appears to be on its own filesystem and is not already mounted. This is not a supported setup. Some things will probably break (sometimes even silently) in mysterious ways. Consult http://freedesktop.org/wiki/Software/systemd/separate-usr-is-broken

  Basically systemd cannot deal with /usr being on a separate partition.
  That needs to be fixed or systemd should not be used for upgrades with
  a separate /usr partition.

  This is related to bug 1460790 but asking for systemd to actually be fixed.
  Please see bug 1460790 if you are looking for a work around on this issue.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: systemd 219-7ubuntu5
  ProcVersionSignature: Ubuntu 3.19.0-18.18-generic 3.19.6
  Uname: Linux 3.19.0-18-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1.1
  Architecture: amd64
  Date: Mon Jun  1 15:29:32 2015
  InstallationDate: Installed on 2010-05-23 (1835 days ago)
  InstallationMedia: Ubuntu-Server 10.04 LTS "Lucid Lynx" - Release amd64 (20100427)
  MachineType: Supermicro X8STi
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_CA.UTF-8
   SHELL=/bin/tcsh
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-18-generic root=UUID=676235cd-93b1-426e-8336-fa0078d96145 ro quiet acpi=off pci=noacpi
  SourcePackage: systemd
  UpgradeStatus: Upgraded to vivid on 2015-06-01 (0 days ago)
  dmi.bios.date: 09/17/10
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 2.0
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: X8STi
  dmi.board.vendor: Supermicro
  dmi.board.version: 1234567890
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: Supermicro
  dmi.chassis.version: 1234567890
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr2.0:bd09/17/10:svnSupermicro:pnX8STi:pvr1234567890:rvnSupermicro:rnX8STi:rvr1234567890:cvnSupermicro:ct3:cvr1234567890:
  dmi.product.name: X8STi
  dmi.product.version: 1234567890
  dmi.sys.vendor: Supermicro

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