Before reporting a bug in bash-completion, please check that you don't have Acrobat's acroread.sh installed in /etc/bash_completion.d/. That completion, in fact, redefines internal bash-completion functions, breaking it. For more information about this issue, please read: - http://forums.adobe.com/thread/745833 - http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=616018