do-release-upgrade exits with "An unresolvable problem occurred while calculating the upgrade"

[Rich Stillman]

This error comes up both before and after removing two ppas using ppa-purge. Note that I am using a low-latency kernel with bionic. I would suspect this but I upgraded another system running this kernel with no problems.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.40
ProcVersionSignature: Ubuntu 5.4.0-52.57~18.04.1-lowlatency 5.4.65
Uname: Linux 5.4.0-52-lowlatency x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7.18
Architecture: amd64
CrashDB: ubuntu
Date: Tue Nov 3 13:18:42 2020
InstallationDate: Installed on 2020-06-07 (148 days ago)
InstallationMedia: Ubuntu 18.04.4 LTS "Bionic Beaver" - Release amd64 (20200203.1)
PackageArchitecture: all
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
Symptom: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2020-11-03 (0 days ago)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Rich Stillman (mobiguy)]

I've just noticed an additional problem - do-release-upgrade did not restore third-party repositories to /etc/apt/sources.list, so all my third party packages have silently stopped being updated.

[Jesse Mallen (jdmallen)]

I also ran into this exact issue attempting an upgrade from 18.04 to 20.04. Let me know if I can provide any additional detail.

[Rich Stillman (mobiguy)]

Thanks. I eventually removed enough packages from the system to allow the
upgrade to work. It was a long time ago so I don't remember the details
anymore and I think I threw out my notes.

Since then, apt upgrades, including kernel upgrades, have been working fine.

Just one more year, and we get to do this all over again...

On Fri, May 14, 2021 at 11:03 PM Jesse Mallen <email address hidden>
wrote:

> I also ran into this exact issue attempting an upgrade from 18.04 to
> 20.04. Let me know if I can provide any additional detail.
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1902767
>
> Title:
> do-release-upgrade exits with "An unresolvable problem occurred while
> calculating the upgrade"
>
> Status in ubuntu-release-upgrader package in Ubuntu:
> Confirmed
>
> Bug description:
> This error comes up both before and after removing two ppas using ppa-
> purge. Note that I am using a low-latency kernel with bionic. I would
> suspect this but I upgraded another system running this kernel with no
> problems.
>
> ProblemType: Bug
> DistroRelease: Ubuntu 18.04
> Package: ubuntu-release-upgrader-core 1:18.04.40
> ProcVersionSignature: Ubuntu 5.4.0-52.57~18.04.1-lowlatency 5.4.65
> Uname: Linux 5.4.0-52-lowlatency x86_64
> NonfreeKernelModules: nvidia_modeset nvidia
> ApportVersion: 2.20.9-0ubuntu7.18
> Architecture: amd64
> CrashDB: ubuntu
> Date: Tue Nov 3 13:18:42 2020
> InstallationDate: Installed on 2020-06-07 (148 days ago)
> InstallationMedia: Ubuntu 18.04.4 LTS "Bionic Beaver" - Release amd64
> (20200203.1)
> PackageArchitecture: all
> ProcEnviron:
> TERM=xterm-256color
> PATH=(custom, no user)
> LANG=en_US.UTF-8
> SHELL=/bin/bash
> SourcePackage: ubuntu-release-upgrader
> Symptom: ubuntu-release-upgrader
> UpgradeStatus: Upgraded to bionic on 2020-11-03 (0 days ago)
>
> To manage notifications about this bug go to:
>
> https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1902767/+subscriptions
>
>