[Bug 1740767] Re: after upgrading to 17.04 and, maybe, running out of disk space, a further upgrade fails

[Alain]

The problem must have been related to one or more specific packages
which were blocking the upgrade. I have removed a number of packages and
the problem went away.

The bug I would tag is the complete lack of useful information: why
couldn't calculate the upgrade? At which package did it fail? How about
a way to trace the execution to narrow down the problem?

That is what should be fixed.

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https://bugs.launchpad.net/bugs/1740767

Title:
  after upgrading to 17.04 and, maybe, running out of disk space, a
  further upgrade fails

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

Bug description:
  Fetched 38.5 MB in 6s (3'434 kB/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

  ProblemType: Bug
  DistroRelease: Ubuntu 17.04
  Package: ubuntu-release-upgrader-core 1:17.04.10
  ProcVersionSignature: Ubuntu 4.10.0-42.46-generic 4.10.17
  Uname: Linux 4.10.0-42-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl zcommon znvpair
  ApportVersion: 2.20.4-0ubuntu4.9
  Architecture: amd64
  CrashDB: ubuntu
  Date: Mon Jan  1 18:08:01 2018
  InstallationDate: Installed on 2014-05-27 (1314 days ago)
  InstallationMedia: Mythbuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to zesty on 2018-01-01 (0 days ago)

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