[Bug 1241465] Re: do-release-upgrade fails when using update-alternatives to provide different versions of /usr/bin/python

[Daniel Ricao Canelhas]

so, in /DistUpgrade/DistUpgradeController.py

after line 381, inserting something like this would possibly patch this
bug:

                while os.path.islink(fs_default_version) :
                    fs_default_version = os.readlink(fs_default_version)

It would be an endless loop if links are circular though. Adding a counter for a maximum depth is one way out...
Another would be to add the visited links to a list and checking it to see if the current link is already in the list. If so. break and return an error of some sort. But it would be a very unusual configuration to find.

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https://bugs.launchpad.net/bugs/1241465

Title:
  do-release-upgrade fails when using update-alternatives to provide
  different versions of /usr/bin/python

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

Bug description:
  sudo do-release-upgrade

  fails to upgrade 13.04 to 13.10 when update-alternatives is used to
  maintain different versions of python

  e.g.
  sudo update-alternatives --list python
  /usr/bin/python2.7
  /usr/bin/python3.3

  The script complains that the symlink to /usr/bin/python is broken
  regardless of which version is being used to provide python

  a workaround is to remove the symbolic link

  `sudo rm /usr/bin/python`

  and creating it manually

  `sudo rm /usr/bin/python`
  `sudo ln -s /usr/bin/python2.7 /usr/bin/python`
  `sudo do-release-upgrade`

  Apparently using version 3.3 didn't work too well either.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: ubuntu-release-upgrader-core 1:0.205
  ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3
  Uname: Linux 3.11.0-12-generic x86_64
  ApportVersion: 2.12.5-0ubuntu2
  Architecture: amd64
  CrashDB: ubuntu
  Date: Fri Oct 18 11:42:03 2013
  MarkForUpload: True
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  Symptom: release-upgrade
  UpgradeStatus: Upgraded to saucy on 2013-10-18 (0 days ago)

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