I know this has been discussed on other posts but my problem does not seem to be fully resolved and I do not have permission to add a comment to those posts yet :(
listed on help.ubuntu.com > UsingTheTerminal > Save on Typing:
Tab: "It autocompletes any commands or filenames".
After following the advise from apt-get autocomplete I get results after pressing tab twice but no auto completion for commands or files. Running Xubuntu 13.04.