root@magic:~# apt-get upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
3 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Do you want to continue [Y/n]? y
Setting up python-crypto (2.1.0-2+squeeze2) ...
Traceback (most recent call last):
  File "/usr/bin/pycentral", line 2334, in <module>
    main()
  File "/usr/bin/pycentral", line 2328, in main
    rv = action.run(global_options)
  File "/usr/bin/pycentral", line 1477, in run
    runtimes = get_installed_runtimes()
  File "/usr/bin/pycentral", line 278, in get_installed_runtimes
    default_version = pyversions.default_version(version_only=True)
  File "/usr/share/pycentral-data/pyversions.py", line 172, in default_version
    raise ValueError, "/usr/bin/python does not match the python default version. It must be reset to point to %s" % debian_default
ValueError: /usr/bin/python does not match the python default version. It must be reset to point to python2.6
dpkg: error processing python-crypto (--configure):
 subprocess installed post-installation script returned error exit status 1
Setting up python-serial (2.3-1) ...
configured to not write apport reports
                                      Traceback (most recent call last):
  File "/usr/bin/pycentral", line 2334, in <module>
    main()
  File "/usr/bin/pycentral", line 2328, in main
    rv = action.run(global_options)
  File "/usr/bin/pycentral", line 1477, in run
    runtimes = get_installed_runtimes()
  File "/usr/bin/pycentral", line 278, in get_installed_runtimes
    default_version = pyversions.default_version(version_only=True)
  File "/usr/share/pycentral-data/pyversions.py", line 172, in default_version
    raise ValueError, "/usr/bin/python does not match the python default version. It must be reset to point to %s" % debian_default
ValueError: /usr/bin/python does not match the python default version. It must be reset to point to python2.6
dpkg: error processing python-serial (--configure):
 subprocess installed post-installation script returned error exit status 1
configured to not write apport reports
                                      Setting up python-zope.interface (3.5.3-1+b1) ...
Traceback (most recent call last):
  File "/usr/bin/pycentral", line 2334, in <module>
    main()
  File "/usr/bin/pycentral", line 2328, in main
    rv = action.run(global_options)
  File "/usr/bin/pycentral", line 1477, in run
    runtimes = get_installed_runtimes()
  File "/usr/bin/pycentral", line 278, in get_installed_runtimes
    default_version = pyversions.default_version(version_only=True)
  File "/usr/share/pycentral-data/pyversions.py", line 172, in default_version
    raise ValueError, "/usr/bin/python does not match the python default version. It must be reset to point to %s" % debian_default
ValueError: /usr/bin/python does not match the python default version. It must be reset to point to python2.6
dpkg: error processing python-zope.interface (--configure):
 subprocess installed post-installation script returned error exit status 1
configured to not write apport reports
                                      Errors were encountered while processing:
 python-crypto
 python-serial
 python-zope.interface
E: Sub-process /usr/bin/dpkg returned an error code (1)
root@magic:~#