Public bug reported:
On running update-manager -c no new upgrades are seen. But with the -d
option, the upgrade to 18.04.1 becomes available. On choosing to
upgrade, it finishes the first step ("preparing to upgrade"). A pop up
appears saying that third party sources are disabled, and can be re
enabled later on. However, on the next step ("Setting new software
channels") it crashes with the message: "Could not calculate the
upgrade, an unresolvable error occurred while calculating the upgrade".
Ubuntu release description:
Description: Ubuntu 16.04.5 LTS
Release: 16.04
Update-manager version info:
update-manager:
Installed: 1:16.04.13
Candidate: 1:16.04.13
Version table:
*** 1:16.04.13 500
500 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
500 http://archive.ubuntu.com/ubuntu xenial-updates/main i386 Packages
100 /var/lib/dpkg/status
1:16.04.12 500
500 http://archive.ubuntu.com/ubuntu xenial-security/main amd64 Packages
500 http://archive.ubuntu.com/ubuntu xenial-security/main i386 Packages
1:16.04.3 500
500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages
500 http://archive.ubuntu.com/ubuntu xenial/main i386 Packages
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubuntu-release-upgrader-core 1:16.04.25
ProcVersionSignature: Ubuntu 4.15.0-30.32~16.04.1-generic 4.15.18
Uname: Linux 4.15.0-30-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Wed Aug 8 18:58:23 2018
InstallationDate: Installed on 2017-06-24 (409 days ago)
InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64
(20170215.2)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
Symptom: ubuntu-release-upgrader
UpgradeStatus: Upgraded to xenial on 2018-08-08 (0 days ago)
VarLogDistupgradeTermlog:
** Affects: ubuntu-release-upgrader (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug dist-upgrade third-party-packages xenial
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https://bugs.launchpad.net/bugs/1786039
Title:
Upgrade from 16.04.5 to 18.04.1 crashes with message unable to resolve
upgrade
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