[Bug 1913927] [NEW] Can't Upgrade from 18.04 to 20.04 - Unresolvable error

[James Condon]

Public bug reported:

Have tried:

- update and upgrade as below - 0 held back (initially nvidia-docker-runtime, now removed)
- removing files in /etc/app/sources.list and sources.list.d
- cuberduck and nvidia-docker - removed but still showing here.

`sudo apt-get update && sudo apt-get upgrade`
`sudo apt update && sudo apt ugprade`
`sudo apt-get dist-upgrade'
`sudo do-release-upgrade`

throws:

Could not calculate the upgrade

An unresolvable problem occurred while calculating the upgrade.

if I run software updates app / gui, nothing happens after pressing
upgrade button.

also tried `sudo apt-get install kde-style-breeze` and multiple reboots.

Any help, much appreciated.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.42
ProcVersionSignature: Ubuntu 4.15.0-135.139-generic 4.15.18
Uname: Linux 4.15.0-135-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7.21
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: GNOME
Date: Sun Jan 31 16:13:51 2021
InstallationDate: Installed on 2018-12-12 (781 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2021-01-31 (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/1913927

Title:
  Can't Upgrade from 18.04 to 20.04 - Unresolvable error

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

Bug description:
  Have tried:

  - update and upgrade as below - 0 held back (initially nvidia-docker-runtime, now removed)
  - removing files in /etc/app/sources.list and sources.list.d
  - cuberduck and nvidia-docker - removed but still showing here.

  `sudo apt-get update && sudo apt-get upgrade`
  `sudo apt update && sudo apt ugprade`
  `sudo apt-get dist-upgrade'
  `sudo do-release-upgrade`

  throws:

  Could not calculate the upgrade

  An unresolvable problem occurred while calculating the upgrade.

  if I run software updates app / gui, nothing happens after pressing
  upgrade button.

  also tried `sudo apt-get install kde-style-breeze` and multiple
  reboots.

  Any help, much appreciated.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.42
  ProcVersionSignature: Ubuntu 4.15.0-135.139-generic 4.15.18
  Uname: Linux 4.15.0-135-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.9-0ubuntu7.21
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: GNOME
  Date: Sun Jan 31 16:13:51 2021
  InstallationDate: Installed on 2018-12-12 (781 days ago)
  InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2021-01-31 (0 days ago)

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