please reopen if this is still an issue

** Changed in: systemd (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1802469

Title:
  after upgrade to 18.04 the system sometimes just boots into emergency
  mode

Status in systemd package in Ubuntu:
  Invalid

Bug description:
  After I updated my server (no GUI) from 16.04 to 18.04 my system sometimes 
gets stuck in emergency mode.
  Normally my system needs about 20 seconds to get through the dmesg part, and 
then another 2-5 seconds until the login prompt.

  The dmesg part is still fine but, after that, about once a week, I see
  very slow boot messages dripping down the screen at a rate of 1
  line/second.

  If this happens, somewhere along the way, the system issues a warning
  about a device which has timed out like below:

  dev-disk-by\x2duuid-db5f4fae\x2d18a0\x2d4df3\x2d8ba3\x2d709f00eac21c.device:
  Job 
dev-disk-by\x2duuid-db5f4fae\x2d18a0\x2d4df3\x2d8ba3\x2d709f00eac21c.device/start
 timed out.`

  and, some time later, there is a message about starting an emergency shell.
  But then, the system seems to hang, and I get no prompt nor any console 
feedback upon typing.

  I can issue a Ctrl+Alt+Del though which does a reboot.
  After I had done that the system up to now always came up properly in about 
20 seconds as stated above and I do not see the device which was complained 
about before.

  I have no clue how I can troubleshoot the issue.
  Is this a known problem due to some conflicting conditions in the "glorious" 
systemd boot mechanisms?
  Is there a command like "systemd-analyze blame" which can analyze a failed 
previous boot?

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: systemd 237-3ubuntu10.4
  ProcVersionSignature: Ubuntu 4.15.0-38.41-generic 4.15.18
  Uname: Linux 4.15.0-38-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.4
  Architecture: amd64
  Date: Fri Nov  9 08:52:32 2018
  MachineType: ASUSTeK COMPUTER INC. P9D-X Series
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-38-generic 
root=UUID=0fa1f208-3a7b-44ca-9f85-e7349a3b1844 ro nosplash
  SourcePackage: systemd
  UpgradeStatus: Upgraded to bionic on 2018-10-11 (28 days ago)
  dmi.bios.date: 10/13/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 0901
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: P9D-X Series
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 17
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr0901:bd10/13/2014:svnASUSTeKCOMPUTERINC.:pnP9D-XSeries:pvrRev1.xx:rvnASUSTeKCOMPUTERINC.:rnP9D-XSeries:rvrRev1.xx:cvnToBeFilledByO.E.M.:ct17:cvrToBeFilledByO.E.M.:
  dmi.product.family: To be filled by O.E.M.
  dmi.product.name: P9D-X Series
  dmi.product.version: Rev 1.xx
  dmi.sys.vendor: ASUSTeK COMPUTER INC.

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