** Package changed: ubuntu-release-upgrader (Ubuntu) => linux (Ubuntu)

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https://bugs.launchpad.net/bugs/1877890

Title:
  System Hangs when trying to kill a Window

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Dear Sirs,
  I'm a long term user of Ubuntu,
  I run a Client/Server system that my clients expect to be very stable.
  I ran under Trust Tahr for a long while with great success and no Hangups at 
all.
  I recently upgraded to Bionic Beaver and I find that I have a number of
  Hangups.
  They seem to occur mostly when switching between different users.
  The latest one that occurred last night that I want to show you here was
  caused by something else.
  I was watching a video from Youtube under Firefox.
  At the end of it I clicked the upper right hand button of the window
  to kill the screen. At this point the system froze on me.
  I could move the mouse around but none of the keys worked.
  I used the SysrRq - Magic Key combination to get the following information
  ALT + PrtScrn, ALT + CREISUB
  The system re-booted and gave me the following files in /var/crash
    4096 May  9 23:38 202005092338
     349 May 10 11:01 kexec_cmd
   25387 May  9 23:39 linux-image-5.3.0-51-generic-202005092338.crash

       69696 May  9 23:38 dmesg.202005092338
   291014103 May  9 23:38 dump.202005092338

  I used the crash program with the Symbols file and in the backtrace section
     under the exception line it says:
             exception RIP mwait_idle+132
     in the disassembly of mwait_idle
      the line at +132 is
            mov    %gs:0x72774cb4(%rip),%r12d        # 0x10350

  Any information that I can supply to you I will be glad to in order to
  aid you in solving this problem.

  I'm fairly computer literate and so I can follow any directions that
  you want to give to me.

  I have enjoyed using Ubutnu for many years but I do need a Stable
  environment for my Development work and for my users satisfaction.

  Yours truly,
  Frank Krauss

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.37
  ProcVersionSignature: Ubuntu 5.3.0-51.44~18.04.2-generic 5.3.18
  Uname: Linux 5.3.0-51-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.14
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Sun May 10 13:19:54 2020
  InstallationDate: Installed on 2020-04-20 (19 days ago)
  InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 
(20190805)
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  Symptom: release-upgrade
  UpgradeStatus: No upgrade log present (probably fresh install)

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