Public bug reported:
-Source package: ubuntu-release-upgrader-core
1) lsb_release -rd:
Description: Ubuntu 16.04.5 LTS
Release: 16.04
2) apt-cache policy ubuntu-release-upgrader-core:
ubuntu-release-upgrader-core:
Installato: 1:16.04.25
Candidato: 1:16.04.25
Tabella versione:
*** 1:16.04.25 500
500 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
500 http://archive.ubuntu.com/ubuntu xenial-updates/main i386 Packages
500 http://archive.ubuntu.com/ubuntu xenial-security/main amd64 Packages
500 http://archive.ubuntu.com/ubuntu xenial-security/main i386 Packages
100 /var/lib/dpkg/status
1:16.04.12 500
500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages
500 http://archive.ubuntu.com/ubuntu xenial/main i386 Packages
3) I expected to upgrade smoothly from Ubuntu 16.04 LTS to 18.04 LTS.
4) Instead, when using 'sudo do-release-upgrade' the process stops,
throwing the error message 'could not calculate upgrade' and suggesting
different causes. Unfortunately, all of them are beyond my understanding
and therefore I don't know which package could cause this problem.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubuntu-release-upgrader-core 1:16.04.25
ProcVersionSignature: Ubuntu 4.4.0-133.159-generic 4.4.134
Uname: Linux 4.4.0-133-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Mon Aug 20 18:15:32 2018
InstallationDate: Installed on 2014-06-21 (1520 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to xenial on 2018-08-20 (0 days ago)
** Affects: ubuntu-release-upgrader (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug dist-upgrade third-party-packages xenial
** Attachment added: "main.log"
https://bugs.launchpad.net/bugs/1787990/+attachment/5178136/+files/main.log
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https://bugs.launchpad.net/bugs/1787990
Title:
Failed upgrade from 16.04 to 18.04: could not calculate upgrade
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