[Bug 1906867] [NEW] cannot upgrade to 20.04

[Bressan Franco]

Public bug reported:

Attempting to upgrade returns error: 
"impossible to calculate changes"

Upon checking main.log file in /var/log/dist-upgrade i encoutered this too errors:
2020-12-04 19:43:10,886 ERROR NvidiaDetection returned a error: invalid literal for int() with base 10: 'server'
2020-12-04 19:43:11,546 WARNING Can't mark 'ubuntu-desktop' for upgrade (E:Errore, pkgProblemResolver::Resolve ha generato delle interruzioni. Questo potrebbe essere causato da pacchetti bloccati.)
2020-12-04 19:43:12,083 ERROR Dist-upgrade failed: 'Broken packages after upgrade: colord'

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.41
ProcVersionSignature: Ubuntu 5.4.0-56.62~18.04.1-generic 5.4.73
Uname: Linux 5.4.0-56-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.20
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Fri Dec  4 19:44:16 2020
PackageArchitecture: all
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=it_IT.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
Symptom: release-upgrade
UpgradeStatus: Upgraded to bionic on 2020-12-04 (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/1906867

Title:
  cannot upgrade to 20.04

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

Bug description:
  Attempting to upgrade returns error: 
  "impossible to calculate changes"

  Upon checking main.log file in /var/log/dist-upgrade i encoutered this too errors:
  2020-12-04 19:43:10,886 ERROR NvidiaDetection returned a error: invalid literal for int() with base 10: 'server'
  2020-12-04 19:43:11,546 WARNING Can't mark 'ubuntu-desktop' for upgrade (E:Errore, pkgProblemResolver::Resolve ha generato delle interruzioni. Questo potrebbe essere causato da pacchetti bloccati.)
  2020-12-04 19:43:12,083 ERROR Dist-upgrade failed: 'Broken packages after upgrade: colord'

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.41
  ProcVersionSignature: Ubuntu 5.4.0-56.62~18.04.1-generic 5.4.73
  Uname: Linux 5.4.0-56-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.20
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Fri Dec  4 19:44:16 2020
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=it_IT.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  Symptom: release-upgrade
  UpgradeStatus: Upgraded to bionic on 2020-12-04 (0 days ago)

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