Marked as requested, as it also happens with the latest upstream kernel.

Also, booting without acpi=off takes a very long time (1 minute?) before my 
passphrase is asked (the logical volume is not found at first, and the system 
has to perform a lot of scanning). With acpi=off, the question is asked almost 
immediately.
I don't know whether it is related...

Thanks,
MZ

** Tags added: kernel-bug-exists-upstream

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1781889

Title:
  System freezes on restart or shutdown

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Using default GRUB parameters ("quiet splash" or even "noquiet"), I'm
  unable to reboot or shutdown: the Plymouth circle starts spinning,
  then it stops and the system is frozen (altgr+sysrq won't work
  either).

  If I use "acpi=off", I can reboot but obviously the system will not
  shutdown (although I can get to a point where it is safe to hold the
  power button for 3 seconds).

  I also tried "acpi=noirq", "acpi=noapic", "acpi=nolapic", "pci=noacpi"
  with no success.

  Ubuntu 12.04 worked well, so this is a regression.

  Thanks,
  MZ

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: linux-image-4.15.0-23-generic 4.15.0-23.25
  ProcVersionSignature: Ubuntu 4.15.0-23.25-generic 4.15.18
  Uname: Linux 4.15.0-23-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  marco      1252 F.... pulseaudio
  CurrentDesktop: XFCE
  Date: Mon Jul 16 11:27:28 2018
  HibernationDevice: RESUME=UUID=4045c49f-ab1a-446d-8515-a10466ea5852
  InstallationDate: Installed on 2018-07-14 (1 days ago)
  InstallationMedia: Xubuntu 18.04 LTS "Bionic Beaver" - Release amd64 
(20180426)
  MachineType: Dell Inc. Vostro   1000
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-23-generic 
root=/dev/mapper/xubuntu--vg-root ro quiet splash acpi=off vt.handoff=1
  RelatedPackageVersions:
   linux-restricted-modules-4.15.0-23-generic N/A
   linux-backports-modules-4.15.0-23-generic  N/A
   linux-firmware                             1.173.1
  RfKill:
   0: phy0: Wireless LAN
        Soft blocked: no
        Hard blocked: no
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/23/2006
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 2.6.1
  dmi.board.name: 0WY383
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: Not Specified
  dmi.modalias: 
dmi:bvnDellInc.:bvr2.6.1:bd08/23/2006:svnDellInc.:pnVostro1000:pvrNotSpecified:rvnDellInc.:rn0WY383:rvr:cvnDellInc.:ct8:cvrNotSpecified:
  dmi.product.name: Vostro   1000
  dmi.product.version: Not Specified
  dmi.sys.vendor: Dell Inc.

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