The Ubuntu lastfmsubmitd package is missing a vital piece, which is the lastfmsubmit program (note the lack of a "d" at the end).
To use lastfmsubmit on Ubuntu, do this:
sudo apt-get install lastfmsubmitdand then download the lastfmsubmitd source tarball from here: http://www.red-bean.com/~decklin/software/lastfmsubmitd/lastfmsubmitd-0.35.tar.bz2
And unzip it and copy the lastfmsubmit program into your path like this:
tar -xjf lastfmsubmitd-0.35.tar.bz2
sudo cp lastfmsubmitd-0.35/lastfmsubmit /usr/bin
Now GSSMP should allow you to check the box to turn on last.fm submission.
Note: if you use a tarball later than version 0.35, everything is more difficult since you need the client.py module as well as the lastfmsubmit file.
It looks likely that you will have to do a similar thing to Ubuntu users: install the lastfmsubmitd package and manually copy the lastfmsubmit program from the source tarball of version 0.35. Let me know if you manage it on your distro and I'll be glad to put more detailed instructions here.
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