Public bug reported:

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)

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug dist-upgrade raring

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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

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