Just installed UQM 0.6.2 on Ubuntu 7.10.
For your information, installing voice is slightly different here.
Open the voice UQM file with Archive manager, extract it to a directory where you have access to, then copy the contents to the /usr/share/games/content directory ( with sudo, of course ).
For Voice: You'll find a directory named "comm" in the UQM archive, and just place the files in the content/comm directory. It will work now.