[Bug 1460794] [NEW] systemd will not work with a separate /usr partition

[Robert Hardy]

Public bug reported:

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

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug vivid

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https://bugs.launchpad.net/bugs/1460794

Title:
  systemd will not work with a separate /usr partition

Status in systemd package in Ubuntu:
  New

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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