Upgrade from 18.04 to 20.04: "An unresolvable problem occurred while calculating the upgrade." apt.log shows hundreds of broken things.

[Chuck Cooperman]

Upgrade from 18.04 to 20.04:

Could not calculate the upgrade

An unresolvable problem occurred while calculating the upgrade.

 If none of this applies, then please report this bug using the command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal. If you want to investigate this yourself the log files in '/var/log/dist-upgrade' will contain details about the upgrade. Specifically, look at 'main.log' and 'apt.log'."

apt.log shows hundreds of broken things.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.38
ProcVersionSignature: Ubuntu 4.15.0-118.119-generic 4.15.18
Uname: Linux 4.15.0-118-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.17
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Wed Sep 23 19:03:47 2020
InstallationDate: Installed on 2016-01-04 (1724 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
PackageArchitecture: all
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2020-09-23 (0 days ago)
VarLogDistupgradeTermlog:

mtime.conffile..etc.update-manager.release-upgrades: 2020-09-23T18:00:44.468934

[Daniel Letzeisen (dtl131)]

I don't claim to be an expert, but if possible, remove gnuradio (and gnuradio-dev) and reinstall it after upgrade. That's what looks to be causing the cascade of errors in your apt log.

Let me/us know if that works.

[Chuck Cooperman (coopecb1)]

Sorry, I already went ahead with a clean install. I do recall having a similar problem with 16.04 > 18.04 and that gnuradio had something to do with it.

From: Daniel Letzeisen<mailto:<email address hidden>>
Sent: Friday, September 25, 2020 1:20 AM
To: <email address hidden><mailto:<email address hidden>>
Subject: [Bug 1896848] Re: Upgrade from 18.04 to 20.04: "An unresolvable problem occurred while calculating the upgrade." apt.log shows hundreds of broken things.

I don't claim to be an expert, but if possible, remove gnuradio (and
gnuradio-dev) and reinstall it after upgrade. That's what looks to be
causing the cascade of errors in your apt log.

Let me/us know if that works.

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => Incomplete

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Title:
  Upgrade from 18.04 to 20.04: "An unresolvable problem occurred while
  calculating the upgrade." apt.log shows hundreds of broken things.

Status in ubuntu-release-upgrader package in Ubuntu:
  Incomplete

Bug description:
  Upgrade from 18.04 to 20.04:

  Could not calculate the upgrade

  An unresolvable problem occurred while calculating the upgrade.

   If none of this applies, then please report this bug using the
  command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal. If
  you want to investigate this yourself the log files in '/var/log/dist-
  upgrade' will contain details about the upgrade. Specifically, look at
  'main.log' and 'apt.log'."

  apt.log shows hundreds of broken things.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.38
  ProcVersionSignature: Ubuntu 4.15.0-118.119-generic 4.15.18
  Uname: Linux 4.15.0-118-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.17
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Sep 23 19:03:47 2020
  InstallationDate: Installed on 2016-01-04 (1724 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-09-23 (0 days ago)
  VarLogDistupgradeTermlog:

  mtime.conffile..etc.update-manager.release-upgrades: 2020-09-23T18:00:44.468934

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[Daniel Letzeisen (dtl131)]

No problem. I prefer clean installs (or rolling release distros) myself.