[Bug 1926645] [NEW] update fails from 18 to 20 but everything is ok

[Alberto]

Public bug reported:

I remove any possible ppa package
checked all dependencies
reinstalled lots of libs in the apt.log and main.log
no packages on hold

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.44
ProcVersionSignature: Ubuntu 4.15.0-142.146-generic 4.15.18
Uname: Linux 4.15.0-142-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.23
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: XFCE
Date: Thu Apr 29 19:37:04 2021
InstallationDate: Installed on 2017-12-24 (1222 days ago)
InstallationMedia: Xubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
Symptom: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2021-04-29 (0 days ago)

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


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

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https://bugs.launchpad.net/bugs/1926645

Title:
  update fails from 18 to 20 but everything is ok

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

Bug description:
  I remove any possible ppa package
  checked all dependencies
  reinstalled lots of libs in the apt.log and main.log
  no packages on hold

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.44
  ProcVersionSignature: Ubuntu 4.15.0-142.146-generic 4.15.18
  Uname: Linux 4.15.0-142-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.23
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: XFCE
  Date: Thu Apr 29 19:37:04 2021
  InstallationDate: Installed on 2017-12-24 (1222 days ago)
  InstallationMedia: Xubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  Symptom: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2021-04-29 (0 days ago)

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