Public bug reported:
upgrade performed with do-release-upgrade fails to find a solution and
restores the previous system state while running in "screen". The
failure occurs whether the upgrade is launched from gnome-terminal in
the GUI or at the console, after the following messages:
...[various messages looking OK]...
Calculating the changes
Calculating the changes
Do you want to start the upgrade?
24 installed packages are no longer supported by Canonical. You can
still get support from the community.
267 packages are going to be removed. 746 new packages are going to
be installed. 3313 packages are going to be upgraded.
Fetching and installing the upgrade can take several hours. Once the
download has finished, the process cannot be canceled.
Continue [yN] Details [d]y
Lock screen disabled
Your lock screen has been disabled and will remain disabled until you
reboot.
To continue please press [ENTER]
Inhibiting until Ctrl+C is pressed...
Fetching
Fetched 0 B in 0s (0 B/s)
Upgrading
Inhibiting until Ctrl+C is pressed...
Fetched 0 B in 0s (0 B/s)
Upgrading
Inhibiting until Ctrl+C is pressed...
Fetched 0 B in 0s (0 B/s)
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating the changes
Calculating the changes
Could not calculate the upgrade
An unresolvable problem occurred while calculating the upgrade.
This can be caused by:
* Upgrading to a pre-release version of Ubuntu
* Running the current pre-release version of Ubuntu
* Unofficial software packages not provided by Ubuntu
If none of this applies, then please report this bug using the
command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal.
Restoring original system state
Aborting
Reading package lists... Done
Building dependency tree
Reading state information... Done
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubuntu-release-upgrader-core 1:16.04.25
ProcVersionSignature: Ubuntu 4.15.0-33.36~16.04.1-generic 4.15.18
Uname: Linux 4.15.0-33-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Tue Aug 28 23:49:25 2018
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to xenial on 2018-08-28 (0 days ago)
VarLogDistupgradeApttermlog:
Log started: 2018-08-28 23:48:28
Log ended: 2018-08-28 23:48:32
Log started: 2018-08-28 23:48:36
Log ended: 2018-08-28 23:48:36
** 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/1789507
Title:
bionic upgrader fails quickly after downloads
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https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1789507/+subscriptions
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