[Bug 1798729] Re: release upgrade from 18.04 to 18.10 cannot calculate upgrade, no reason given

[Brian Murray]

The following packages seem to be leftover from an old release of Ubuntu
which you were running. Could you try using 'sudo apt autoremove' to see
if they are removed automatically or try removing them manually and then
upgrading? Thanks in advance.

>From VarLogDistUpgradeMain.log:

emacs24-common emacs24-common-non-dfsg emacs24-lucid

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

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https://bugs.launchpad.net/bugs/1798729

Title:
  release upgrade from 18.04 to 18.10 cannot calculate upgrade, no
  reason given

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

Bug description:
  do-release-upgrade cannot calculate the upgrade, offers no useful
  insight as to why, and provides no way to see the actual underlying
  error.

  ====

  Reading cache

  Checking package manager
  Reading package lists... Done
  Building dependency tree
  Reading state information... Done
  Hit http://us.archive.ubuntu.com/ubuntu bionic InRelease
  Hit http://us.archive.ubuntu.com/ubuntu bionic-updates InRelease
  Hit http://us.archive.ubuntu.com/ubuntu bionic-backports InRelease
  Hit http://security.ubuntu.com/ubuntu bionic-security InRelease
  Fetched 0 B in 0s (0 B/s)
  Reading package lists... Done    
  Building dependency tree          
  Reading state information... Done

  Updating repository information
  Hit http://security.ubuntu.com/ubuntu cosmic-security InRelease                                          
  Hit http://us.archive.ubuntu.com/ubuntu cosmic InRelease                                                 
  Hit http://us.archive.ubuntu.com/ubuntu cosmic-updates InRelease                                         
  Hit http://us.archive.ubuntu.com/ubuntu cosmic-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

  Could not calculate the upgrade

  An unresolvable problem occurred while calculating the upgrade.

  This can be caused by: 
  * Upgrading to a pre-release version of Ubuntu 
  * Running the current pre-release version of Ubuntu 
  * Unofficial software packages not provided by Ubuntu 

  If none of this applies, then please report this bug using the 
  command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal. 

  
  Restoring original system state

  Aborting
  Reading package lists... Done    
  Building dependency tree          
  Reading state information... Done
  === Command terminated with exit status 1 (Thu Oct 18 21:53:52 2018) ===

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.27
  ProcVersionSignature: Ubuntu 4.15.0-36.39-generic 4.15.18
  Uname: Linux 4.15.0-36-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.4
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: GNOME
  Date: Thu Oct 18 21:49:00 2018
  InstallationDate: Installed on 2015-12-17 (1036 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2018-10-19 (0 days ago)
  mtime.conffile..etc.update-manager.release-upgrades: 2018-10-18T21:43:55.313922

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