[Bug 1924839] [NEW] Can't upgrade from 18.04 to 20.x

[Dmitry]

Public bug reported:

I try to upgrade to Ubuntu 20, but with no success. I've uncheck all
other software sources except standard ones. In finally I see
https://i.imgur.com/btbHwYE.png

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.42
Uname: Linux 5.8.0-050800-lowlatency x86_64
NonfreeKernelModules: veeamsnap
ApportVersion: 2.20.9-0ubuntu7.23
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: KDE
Date: Sat Apr 17 12:55:02 2021
InstallationDate: Installed on 2020-04-07 (374 days ago)
InstallationMedia: Ubuntu 18.04.4 LTS "Bionic Beaver" - Release amd64 (20200203.1)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2021-04-17 (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/1924839

Title:
  Can't upgrade from 18.04 to 20.x

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

Bug description:
  I try to upgrade to Ubuntu 20, but with no success. I've uncheck all
  other software sources except standard ones. In finally I see
  https://i.imgur.com/btbHwYE.png

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.42
  Uname: Linux 5.8.0-050800-lowlatency x86_64
  NonfreeKernelModules: veeamsnap
  ApportVersion: 2.20.9-0ubuntu7.23
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: KDE
  Date: Sat Apr 17 12:55:02 2021
  InstallationDate: Installed on 2020-04-07 (374 days ago)
  InstallationMedia: Ubuntu 18.04.4 LTS "Bionic Beaver" - Release amd64 (20200203.1)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2021-04-17 (0 days ago)
  VarLogDistupgradeTermlog:

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