[Bug 1851475] Re: aborting without informative error message

[Chippo Elder]

Oh no! I posted the above comment into the wrong thread. I can't seem to
delete it. Sorry.

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https://bugs.launchpad.net/bugs/1851475

Title:
  aborting without informative error message

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

Bug description:
  I'm trying to upgrade from 19.10 to 20.04 (devel). Unfortunately, the do-release-upgrade process aborts after "Calculating the changes" without saying why:
  ```
  sudo do-release-upgrade -d
  ```
  ```
  Checking for a new Ubuntu release
  Get:1 Upgrade tool signature [1,554 B]                                                                                                                       
  Get:2 Upgrade tool [1,334 kB]                                                                                                                                
  Fetched 1,335 kB in 0s (0 B/s)                                                                                                                               
  authenticate 'focal.tar.gz' against 'focal.tar.gz.gpg' 
  extracting 'focal.tar.gz'

  Reading cache

  Checking package manager
  Reading package lists... Done
  Building dependency tree        
  Reading state information... Done
  Hit http://de.archive.ubuntu.com/ubuntu eoan InRelease                                                                                                       
  Hit http://de.archive.ubuntu.com/ubuntu eoan-updates InRelease                                                                                               
  Ign http://dl.google.com/linux/chrome/deb stable InRelease                                                                                                   
  Hit http://ppa.launchpad.net/nschloe/inkscape-backports/ubuntu eoan InRelease                                                                                
  Hit http://de.archive.ubuntu.com/ubuntu eoan-backports InRelease                                                                                             
  Hit http://dl.google.com/linux/chrome/deb stable Release                                                                                                     
  Hit http://ppa.launchpad.net/nschloe/mmg-test/ubuntu eoan InRelease                                                                                          
  Hit http://ppa.launchpad.net/nschloe/trilinos-backports/ubuntu eoan InRelease                                                                                
  Ign https://dl.bintray.com/etcher/debian stable InRelease                                                                                                    
  Get:1 https://dl.bintray.com/etcher/debian stable Release [3,674 B]                                                                                          
  Fetched 3,674 B in 0s (0 B/s)                                                                                                                                
  Reading package lists... Done    
  Building dependency tree          
  Reading state information... Done

  Updating repository information

  Third party sources disabled

  Some third party entries in your sources.list were disabled. You can 
  re-enable them after the upgrade with the 'software-properties' tool 
  or your package manager. 

  To continue please press [ENTER]

  Hit http://de.archive.ubuntu.com/ubuntu eoan InRelease                                                                                                       
  Hit http://de.archive.ubuntu.com/ubuntu eoan-updates InRelease                                                                                               
  Hit http://de.archive.ubuntu.com/ubuntu eoan-backports InRelease                                                                                             
  Fetched 0 B in 0s (0 B/s)                                                                                                                                    

  Checking package manager
  Reading package lists... Done    
  Building dependency tree          
  Reading state information... Done

  Calculating the changes

  Calculating the changes

  Restoring original system state

  Aborting
  Reading package lists... Done    
  Building dependency tree          
  Reading state information... Done
  ```

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