[Bug 1622329] Re: Ubuntu 14.04.5 LTS upgrade to 16 fails via Software Updater

[Artem V L]

*** This bug is a duplicate of bug 1384946 ***
    https://bugs.launchpad.net/bugs/1384946

I managed to perform the upgrade checking the logs (/var/log/dist-
upgrade/apt.log) and solving the issues with "Broken" packages. However,
it would be much better to have this step included into the upgrade
asking a) whether to remove the packages that prevent the upgrade (and
listing the packages) or b) skip the upgrade to manually solve the
issue.

Moreover, after the upgrade I ended up with broken apt-get (it required libc, which required gcc-base) and had to manually download the libraries and install them via dpkg.
As it found, I was not the first who faced this issue, but it can be and should be considered during the upgrade process.

Thanks for your time and for the free Linux OS, hope this feedback helps
to improve the reliability of the installation process.

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https://bugs.launchpad.net/bugs/1622329

Title:
  Ubuntu 14.04.5 LTS upgrade to 16 fails via Software Updater

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

Bug description:
  On the attempt to upgrade Ubuntu 14 to 16 via the Software Updater the
  following dialog window appears:

  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.

  
  This dialog appears on the second step of the upgrade:
  Preparing to upgrade  [OK]
  Setting new software channels  <- Fails
  ...

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: ubuntu-release-upgrader-core 1:0.220.8
  ProcVersionSignature: Ubuntu 3.13.0-95.142-generic 3.13.11-ckt39
  Uname: Linux 3.13.0-95-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.21
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Sun Sep 11 13:57:14 2016
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2014-10-25 (686 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to trusty on 2016-09-11 (0 days ago)
  VarLogDistupgradeTermlog:

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