[Bug 1395000] Re: Dist-upgrade failed with no explanation (real reason: blacklisted ubuntu-next)

[Launchpad Bug Tracker]

** Branch linked: lp:ubuntu/vivid-proposed/ubuntu-release-upgrader

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https://bugs.launchpad.net/bugs/1395000

Title:
  Dist-upgrade failed with no explanation (real reason: blacklisted
  ubuntu-next)

Status in ubuntu-release-upgrader package in Ubuntu:
  Fix Committed

Bug description:
  > do-release-upgrade -d
  […]
  Änderungen werden berechnet

  Es konnte nicht ermittelt werden, welche Systemaktualisierungen 
  verfügbar sind 

  Ein unlösbares Problem trat beim Ermitteln der Systemaktualisierung 
  auf. 
  […]

  > tail /var/log/dist-upgrade/main.log
  2014-11-21 13:32:56,079 DEBUG blacklist expr 'ubuntu-desktop' matches 'ubuntu-desktop-next'
  2014-11-21 13:32:56,079 DEBUG The package 'ubuntu-desktop-next' is marked for removal but it's in the removal blacklist
  2014-11-21 13:32:56,186 ERROR Dist-upgrade failed: 'Das Paket »ubuntu-desktop-next« ist zum Löschen vorgesehen, wurde aber durch das System gesperrt.'
  2014-11-21 13:32:56,187 DEBUG abort called

  
  Full logs attached.

  
  Neither the GUI upgrade nor the command line told me why it failed nor did it point me at the relevant log; I only found it by asking a helpful follow Ubuntu user. Where then I discovered the ERROR.

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