Public bug reported:
During an attempt to upgrade from Ubuntu 16.04 LTS to 18.04 LTS, the
"do-release-upgrade" commands exits due to "an unresolvable problem
occured while calculating the upgrade".
Before the upgrade, I successfully executed apt-get update, apt-get
upgrade and apt-get dist-upgrade without errors or warnings.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubuntu-release-upgrader-core 1:16.04.25
ProcVersionSignature: Ubuntu 4.4.0-112.135-generic 4.4.98
Uname: Linux 4.4.0-112-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
CrashDB: ubuntu
Date: Thu Aug 23 14:25:28 2018
InstallationDate: Installed on 2015-06-15 (1164 days ago)
InstallationMedia: Ubuntu-GNOME 15.04 "Vivid Vervet" - Release amd64 (20150422)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to xenial on 2018-08-23 (0 days ago)
** Affects: ubuntu-release-upgrader (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug dist-upgrade xenial
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https://bugs.launchpad.net/bugs/1788606
Title:
Upgrade from Ubuntu 16.04 to 18.04 fails
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