Public bug reported:

2020-12-15 22:11:48,864 DEBUG quirks: running PreDistUpgradeCache
2020-12-15 22:11:48,864 DEBUG running Quirks.PreDistUpgradeCache
2020-12-15 22:11:48,865 INFO checking for python-dbg
2020-12-15 22:11:48,865 INFO installing python2-dbg because python-dbg was 
installed
2020-12-15 22:11:48,865 DEBUG Installing 'python2-dbg' (python-dbg was 
installed on the system)

Investigating (8) gsettings-desktop-schemas:amd64 < 3.28.0-1ubuntu1 -> 
3.36.0-1ubuntu1 @ii umU Ib >
Broken gsettings-desktop-schemas:amd64 Breaks on mutter:amd64 < 
3.28.4-0ubuntu18.04.2 | 3.36.6-1ubuntu0.20.04.2 @ii umH > (< 3.31.4)
  Considering mutter:amd64 2 as a solution to gsettings-desktop-schemas:amd64 59
  Upgrading mutter:amd64 due to Breaks field in gsettings-desktop-schemas:amd64
Investigating (8) mutter:amd64 < 3.28.4-0ubuntu18.04.2 -> 
3.36.6-1ubuntu0.20.04.2 @ii umU Ib >
Broken mutter:amd64 Depends on gnome-settings-daemon-common:amd64 < none | 
3.36.1-0ubuntu1 @un uH >
  Considering gnome-settings-daemon-common:amd64 0 as a solution to 
mutter:amd64 2
  MarkKeep mutter:amd64 < 3.28.4-0ubuntu18.04.2 -> 3.36.6-1ubuntu0.20.04.2 @ii 
umU Ib > FU=0
  Holding Back mutter:amd64 rather than change 
gnome-settings-daemon-common:amd64
Investigating (9) gsettings-desktop-schemas:amd64 < 3.28.0-1ubuntu1 -> 
3.36.0-1ubuntu1 @ii umU Ib >
Broken gsettings-desktop-schemas:amd64 Breaks on mutter:amd64 < 
3.28.4-0ubuntu18.04.2 | 3.36.6-1ubuntu0.20.04.2 @ii umH > (< 3.31.4)
  Considering mutter:amd64 2 as a solution to gsettings-desktop-schemas:amd64 59
  Upgrading mutter:amd64 due to Breaks field in gsettings-desktop-schemas:amd64
Investigating (9) mutter:amd64 < 3.28.4-0ubuntu18.04.2 -> 
3.36.6-1ubuntu0.20.04.2 @ii umU Ib >
Broken mutter:amd64 Depends on gnome-settings-daemon-common:amd64 < none | 
3.36.1-0ubuntu1 @un uH >
  Considering gnome-settings-daemon-common:amd64 0 as a solution to 
mutter:amd64 2
  MarkKeep mutter:amd64 < 3.28.4-0ubuntu18.04.2 -> 3.36.6-1ubuntu0.20.04.2 @ii 
umU Ib > FU=0
  Holding Back mutter:amd64 rather than change 
gnome-settings-daemon-common:amd64
Done

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.41
ProcVersionSignature: Ubuntu 5.4.0-58.64~18.04.1-generic 5.4.73
Uname: Linux 5.4.0-58-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.20
Architecture: amd64
CrashDB: ubuntu
Date: Tue Dec 15 22:14:49 2020
InstallationDate: Installed on 2019-03-12 (643 days ago)
InstallationMedia: Ubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2020-12-15 (0 days ago)
VarLogDistupgradeTermlog:

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


** Tags: amd64 apport-bug bionic dist-upgrade third-party-packages

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https://bugs.launchpad.net/bugs/1908309

Title:
  Error in upgrading to Ubuntu 20

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