[Bug 1793194] [NEW] Update from 17.10 to 18.04 fails

[pbhj]

Public bug reported:

Running the release upgrader from the tray "alert" the upgrade fails
saying it can't complete.

"Can't install 'kubuntu-desktop'
It was impossible to install a required package. Please report this bug [...]"

[That text is transcribed as the actual modal is un-copyable text for
some bizarre reason. I guess that's a separate bug.]

Launching from command line as `sudo do-release-upgrade -m desktop -f
DistUpgradeViewKDE` gives:

~$ sudo do-release-upgrade -m desktop -f DistUpgradeViewKDE
[sudo] password for pandfi: 
Checking for a new Ubuntu release
Your Ubuntu release is not supported anymore.
For upgrade information, please visit:
http://www.ubuntu.com/releaseendoflife

kde
QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-root'
authenticate 'bionic.tar.gz' against 'bionic.tar.gz.gpg' 
extracting 'bionic.tar.gz'
QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-root'
exitMainLoop

It proceeds to offer to start the upgrade, I declined.

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: ubuntu-release-upgrader-core 1:17.10.11
ProcVersionSignature: Ubuntu 4.13.0-46.51-generic 4.13.16
Uname: Linux 4.13.0-46-generic x86_64
ApportVersion: 2.20.7-0ubuntu3.9
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: KDE
Date: Tue Sep 18 18:50:16 2018
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to artful on 2018-09-18 (0 days ago)
VarLogDistupgradeTermlog:

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug artful dist-upgrade

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https://bugs.launchpad.net/bugs/1793194

Title:
  Update from 17.10 to 18.04 fails

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

Bug description:
  Running the release upgrader from the tray "alert" the upgrade fails
  saying it can't complete.

  "Can't install 'kubuntu-desktop'
  It was impossible to install a required package. Please report this bug [...]"

  [That text is transcribed as the actual modal is un-copyable text for
  some bizarre reason. I guess that's a separate bug.]

  Launching from command line as `sudo do-release-upgrade -m desktop -f
  DistUpgradeViewKDE` gives:

  ~$ sudo do-release-upgrade -m desktop -f DistUpgradeViewKDE
  [sudo] password for pandfi: 
  Checking for a new Ubuntu release
  Your Ubuntu release is not supported anymore.
  For upgrade information, please visit:
  http://www.ubuntu.com/releaseendoflife

  kde
  QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-root'
  authenticate 'bionic.tar.gz' against 'bionic.tar.gz.gpg' 
  extracting 'bionic.tar.gz'
  QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-root'
  exitMainLoop

  It proceeds to offer to start the upgrade, I declined.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: ubuntu-release-upgrader-core 1:17.10.11
  ProcVersionSignature: Ubuntu 4.13.0-46.51-generic 4.13.16
  Uname: Linux 4.13.0-46-generic x86_64
  ApportVersion: 2.20.7-0ubuntu3.9
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: KDE
  Date: Tue Sep 18 18:50:16 2018
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to artful on 2018-09-18 (0 days ago)
  VarLogDistupgradeTermlog:

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