[Bug 1926233] [NEW] Black screen after upgrade 20.04 -> 20.10

[Simon Cornish]

Public bug reported:

Installed 20.04.2 LTS,changed the updater settings and upgraded to 20.10
After boot GRUB is presented as normal
When selecting the default Ubuntu (or waiting the timeout) then blank screen occurs
Backlight is on but the boot does not proceed
I have tried editing the command line with combinations of acpi=off and/or nomodeset without effect.
Also, even if I remove spash & quiet there is still no output at all.

This bug was filed from a clean, updated 20.04 LTS because once I did
the upgrade there was no system available to report the bug from.

Here is something else: I tried the 20.10 and 21.04 desktop installers
(from USB stick) and the behaviour is exactly the same - get to GRUB,
select either Ubuntu or Ubuntu (safe graphics) and then just the black
screen.

I tried the 20.10 server and that could proceed to the text-based
installation.

Obviously the desired outcome in either the upgrade or installer
scenario is that the system boots in a usable manner!

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubuntu-release-upgrader-core 1:20.04.30
ProcVersionSignature: Ubuntu 5.8.0-50.56~20.04.1-generic 5.8.18
Uname: Linux 5.8.0-50-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.16
Architecture: amd64
CasperMD5CheckResult: skip
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Mon Apr 26 17:45:36 2021
InstallationDate: Installed on 2021-04-27 (0 days ago)
InstallationMedia: Ubuntu 20.04.2.0 LTS "Focal Fossa" - Release amd64 (20210209.1)
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: dist-upgrade
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug dist-upgrade focal

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https://bugs.launchpad.net/bugs/1926233

Title:
  Black screen after upgrade 20.04 -> 20.10

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  Installed 20.04.2 LTS,changed the updater settings and upgraded to 20.10
  After boot GRUB is presented as normal
  When selecting the default Ubuntu (or waiting the timeout) then blank screen occurs
  Backlight is on but the boot does not proceed
  I have tried editing the command line with combinations of acpi=off and/or nomodeset without effect.
  Also, even if I remove spash & quiet there is still no output at all.

  This bug was filed from a clean, updated 20.04 LTS because once I did
  the upgrade there was no system available to report the bug from.

  Here is something else: I tried the 20.10 and 21.04 desktop installers
  (from USB stick) and the behaviour is exactly the same - get to GRUB,
  select either Ubuntu or Ubuntu (safe graphics) and then just the black
  screen.

  I tried the 20.10 server and that could proceed to the text-based
  installation.

  Obviously the desired outcome in either the upgrade or installer
  scenario is that the system boots in a usable manner!

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: ubuntu-release-upgrader-core 1:20.04.30
  ProcVersionSignature: Ubuntu 5.8.0-50.56~20.04.1-generic 5.8.18
  Uname: Linux 5.8.0-50-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.16
  Architecture: amd64
  CasperMD5CheckResult: skip
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Mon Apr 26 17:45:36 2021
  InstallationDate: Installed on 2021-04-27 (0 days ago)
  InstallationMedia: Ubuntu 20.04.2.0 LTS "Focal Fossa" - Release amd64 (20210209.1)
  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: dist-upgrade
  UpgradeStatus: No upgrade log present (probably fresh install)

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