[Bug 1928564] Re: systemctl reboot hangs the machine under hirsute 21.04

[Dan Streetman]

sudo systemctl reboot works fine for me. You should check your logs to
see what hung your reboot, or attach your journal logs from a boot where
you reproduced the problem.

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

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Title:
  systemctl reboot hangs the machine under hirsute 21.04

Status in systemd package in Ubuntu:
  Incomplete

Bug description:
  If you type "systemctl reboot" instead of rebooting the machine hangs
  hard, nothing except a hard power cycle seems to get it's attention.
  This is true of both physical hardware and virtual machines, it was
  NOT a problem under groovy.

  ProblemType: Bug
  DistroRelease: Ubuntu 21.04
  Package: systemd 247.3-3ubuntu3
  Uname: Linux 5.12.4 x86_64
  ApportVersion: 2.20.11-0ubuntu65
  Architecture: amd64
  CasperMD5CheckResult: unknown
  CurrentDesktop: MATE
  Date: Sat May 15 19:12:59 2021
  InstallationDate: Installed on 2020-08-10 (278 days ago)
  InstallationMedia: Ubuntu-MATE 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
  MachineType: System manufacturer System Product Name
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.12.4 root=UUID=1065426b-f156-4c90-a98b-e7258e07a88f ro quiet splash vt.handoff=7
  SourcePackage: systemd
  SystemdFailedUnits:
   Error: command ['systemctl', 'status', '--full', '●'] failed with exit code 4: Invalid unit name "●" escaped as "\xe2\x97\x8f" (maybe you should use systemd-escape?).
   Unit \xe2\x97\x8f.service could not be found.
  UpgradeStatus: Upgraded to hirsute on 2021-05-12 (3 days ago)
  dmi.bios.date: 06/04/2020
  dmi.bios.release: 16.2
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 1602
  dmi.board.asset.tag: Default string
  dmi.board.name: PRIME Z390-A
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: Default string
  dmi.chassis.type: 3
  dmi.chassis.vendor: Default string
  dmi.chassis.version: Default string
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1602:bd06/04/2020:br16.2:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnPRIMEZ390-A:rvrRev1.xx:cvnDefaultstring:ct3:cvrDefaultstring:
  dmi.product.family: To be filled by O.E.M.
  dmi.product.name: System Product Name
  dmi.product.sku: ASUS_MB_CNL
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer
  mtime.conffile..etc.systemd.resolved.conf: 2020-12-17T10:04:04

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