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Ubuntu: lsb_release: NameError: global name 'unknown' is not defined

A recent upgrade from Ubuntu Gutsy to Ubuntu Hardy started causing apt to fail due to an internal failure in lsb_release:

# lsb_release
Traceback (most recent call last):
  File "/usr/bin/lsb_release", line 327, in
    main()
  File "/usr/bin/lsb_release", line 291, in main
    distinfo = get_distro_information()
  File "/usr/bin/lsb_release", line 254, in get_distro_information
    distinfo = guess_debian_release()
  File "/usr/bin/lsb_release", line 213, in guess_debian_release
    rinfo = guess_release_from_apt()
  File "/usr/bin/lsb_release", line 169, in guess_release_from_aptv     version = RELEASE_CODENAME_LOOKUP.get(unknown, rinfo.get('suite',''))
NameError: global name 'unknown' is not defined

The problem turned out to be due to these two entries in /etc/apt/sources.list which were being used to get Polarion:

deb http://debian.sh.cvut.cz/debian/ etch main non-free
deb http://security.debian.org/ etch/updates main contrib

Commenting them out fixed the problem. I guess they don't work well with Hardy.

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