[Bug 1611737] Re: Can't upgrade from a release if ros packages are installed from ROS servers

[Kyle Fazzari]

> This makes some upgrades technically not possible since there could
not be packages in the ROS repositories available for the new
distribution in an upgrade process. For example, there is no a single
ROS Release that support 14.04 and 16.04. I can not see a
safe/straightforward upgrade path.

Jose hit this on the head. This is explicitly not supported by ROS. The
problem is, Ubuntu doesn't really have a way of knowing that. I think
the best solution to this issue is a nice error message from the
upgrader. We can detect that ROS is installed, mention that an upgrade
isn't supported, and suggest removing the ROS distro before proceeding.

That said, I'm not familiar with the upgrader. Is there supported way we
could hook such logic in?

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https://bugs.launchpad.net/bugs/1611737

Title:
  Can't upgrade from a release if ros packages are  installed from ROS
  servers

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

Bug description:
  This message was appear when upgrade

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: ubuntu-release-upgrader-core 1:0.220.8
  ProcVersionSignature: Ubuntu 3.19.0-66.74~14.04.1-generic 3.19.8-ckt22
  Uname: Linux 3.19.0-66-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.14.1-0ubuntu3.21
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Wed Aug 10 18:41:24 2016
  InstallationDate: Installed on 2015-09-08 (336 days ago)
  InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to trusty on 2016-08-10 (0 days ago)

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