bash tab completion does not work

[adit]

After typing

man ap
if I press tab twice nothing happens. Same thing after typing

sudo ap
But if I simply type

ap
and press tab twice I get completions.

[adit]

BUMP

This problem started after I deleted hidden files (files that start with a dot) in my home directory.

[dentaku65]

BUMP

This problem started after I deleted hidden files (files that start with a dot) in my home directory.

You have deleted .bashrc file.
It's hard to recover everything after such operation (deleted all hidden files in your /home/<you>); probably you'll have other dysfunctions as well.

You can "recover" .bashrc file creating another user (profile) and then copy on your user (profile) that file.

Good luck.

[adit]

cp /etc/skel/{.bashrc,.bash_logout,.profile} ~/ && . ~/.bashrc
The above code worked. Problem solved.