[Bug 2043243] Re: Release upgrade fails with error about PPAs -- but no PPAs installed

[Greg Ward]

This problem has magically disappeared! I gave up on it for the weekend
and shut the laptop down. Came back to it Monday morning, and the
upgrade to 23.10 worked just fine.

I have no idea if any of my actions fixed it. There were definitely no
updates applied between giving up Friday evening and trying again Monday
morning. I just tried again, and it worked that time.

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https://bugs.launchpad.net/bugs/2043243

Title:
  Release upgrade fails with error about PPAs -- but no PPAs installed

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

Bug description:
  I ran update-manager to upgrade to Ubuntu 23.10. It downloaded a bunch
  of stuff and churned for a while, and then popped up this error
  dialog:

  > Could not calculate the upgrade
  > 
  > An unresolvable problem occurred while calculating the upgrade.
  > 
  >  This was likely caused by:
  >  * Unofficial software packages not provided by Ubuntu
  > Please use the tool 'ppa-purge' from the ppa-purge 
  > package to remove software from a Launchpad PPA and 
  > try the upgrade again.
  > 
  > 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'.

  I do have several third-party repos configured in
  /etc/apt/sources.list.d, but not of them are PPAs. Here's what I have:

  ```
  $ cat brave-browser-release.list
  deb [signed-by=/usr/share/keyrings/brave-browser-archive-keyring.gpg arch=amd64] https://brave-browser-apt-release.s3.brave.com/ stable main

  $ cat google-cloud-sdk.list
  deb [signed-by=/usr/share/keyrings/cloud.google.gpg] https://packages.cloud.google.com/apt cloud-sdk main

  $ cat ngrok.list
  # deb https://ngrok-agent.s3.amazonaws.com buster main # disabled on upgrade to mantic

  $ cat slack.list
  ### THIS FILE IS AUTOMATICALLY CONFIGURED ###
  # You may comment out this entry, but any other modifications may be lost.
  # deb https://packagecloud.io/slacktechnologies/slack/debian/ jessie main # disabled on upgrade to mantic

  $ cat vscode.list
  ### THIS FILE IS AUTOMATICALLY CONFIGURED ###
  # You may comment out this entry, but any other modifications may be lost.
  # deb [arch=amd64,arm64,armhf] http://packages.microsoft.com/repos/code stable main # disabled on upgrade to mantic
  ```

  The bottom of /var/log/dist-upgrade/main.log says this:

  ```
  2023-11-10 18:38:31,862 DEBUG Marking 'ubuntu-desktop' for upgrade
  2023-11-10 18:38:32,045 WARNING Can't mark 'ubuntu-desktop' for upgrade (E:Unable to correct problems, you have held broken packages.)
  2023-11-10 18:38:32,045 DEBUG Marking 'xubuntu-desktop' for upgrade
  2023-11-10 18:38:32,210 WARNING Can't mark 'xubuntu-desktop' for upgrade (E:Unable to correct problems, you have held broken packages.)
  ```

  Hmmmmmmmmm.

  ProblemType: Bug
  DistroRelease: Ubuntu 23.04
  Package: ubuntu-release-upgrader-core 1:23.04.7
  ProcVersionSignature: Ubuntu 6.2.0-1007.7-lowlatency 6.2.12
  Uname: Linux 6.2.0-1007-lowlatency x86_64
  ApportVersion: 2.26.1-0ubuntu2.1
  Architecture: amd64
  CasperMD5CheckResult: pass
  CrashDB: ubuntu
  CrashReports:
   600:117:124:37:2023-11-10 12:50:34.011233923 -0500:2023-11-10 09:50:34.782762954 -0500:/var/crash/_usr_libexec_xfce4-screensaver-dialog.1000.uploaded
   644:1000:124:0:2023-11-10 09:50:34.189762709 -0500:2023-11-10 09:50:34.189762709 -0500:/var/crash/_usr_libexec_xfce4-screensaver-dialog.1000.upload
   640:1000:124:3001891:2023-11-10 09:50:34.188762708 -0500:2023-11-10 09:50:34.223762723 -0500:/var/crash/_usr_libexec_xfce4-screensaver-dialog.1000.crash
  CurrentDesktop: XFCE
  Date: Fri Nov 10 18:40:52 2023
  InstallationDate: Installed on 2022-11-28 (347 days ago)
  InstallationMedia: Ubuntu 22.10 "Kinetic Kudu" - Release amd64 (20221020)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to lunar on 2023-11-10 (0 days ago)
  VarLogDistupgradeTermlog:

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