[Bug 1787697] Re: Upgrade from 16.04 LTS to 18.04 LTS due to ubuntu-toolchain test ppa

[David Browne]

I have the same problem. I used ppa-purge to remove the ppa graphics
drivers. I noticed it's now deselcted in Software & Updates > Other
Software. I've successfully run sudo apt update, sudo apt upgrade and
sudo apt dist-upgrade. Finally when running sudo do-release-upgrade it
still couldn't calculate the upgrade.

I did notice in Software & Updates > Additional Drivers that the NVIDIA
binary driver version 384.145 (proprietary) is still selected. Will this
block the upgrade?

How else can I determine what software is preventing the upgrade, if
that is infact the problem?

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https://bugs.launchpad.net/bugs/1787697

Title:
  Upgrade from 16.04 LTS to 18.04 LTS due to ubuntu-toolchain test ppa

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

Bug description:
  I was offered the upgrade to 18.04 LTS.  I selected, "Upgrade".  It
  started ticking off bullets on the list, and then said,

  | 
  | 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.
  | 

  As you can see, it doesn't really tell me what I need to fix to get
  the upgrade to calculate correctly (ie. the actual thing it found that
  it didn't like).

  I don't want to fall behind, but this bug seems to block me from
  upgrading.  It needs to provide remedy details to allow the operator
  to make targeted corrections and then run again.  Too little info
  provided to be useful.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.25
  ProcVersionSignature: Ubuntu 4.4.0-133.159-generic 4.4.134
  Uname: Linux 4.4.0-133-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Fri Aug 17 23:39:18 2018
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2015-01-26 (1299 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2018-08-18 (0 days ago)
  VarLogDistupgradeTermlog:

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