Comment 3 for bug 446231

Just added -proposed repository:
apt-cache policy gnudatalanguage
gnudatalanguage:
  Installed: (none)
  Candidate: 0.9~rc1-1.1ubuntu2.1
  Version table:
     0.9~rc1-1.1ubuntu2.1 0
        500 http://archive.ubuntu.com karmic-proposed/universe Packages
     0.9~rc1-1.1ubuntu2 0
        500 http://archive.ubuntu.com karmic/universe Packages

The package now installs fine:
fabrice@fabrice-desktop:~/data/build/bugfix$ sudo apt-get install gnudatalanguage
Reading package lists... Done
Building dependency tree
Reading state information... Done
Suggested packages:
  python-matplotlib
The following NEW packages will be installed:
  gnudatalanguage
0 upgraded, 1 newly installed, 0 to remove and 58 not upgraded.
Need to get 0B/1994kB of archives.
After this operation, 7500kB of additional disk space will be used.
Selecting previously deselected package gnudatalanguage.
(Reading database ... 178454 files and directories currently installed.)
Unpacking gnudatalanguage (from .../gnudatalanguage_0.9~rc1-1.1ubuntu2.1_amd64.deb) ...
Processing triggers for man-db ...
Setting up gnudatalanguage (0.9~rc1-1.1ubuntu2.1) ...