Wrong autocompletion with sudo apt-get

Question

Does anybody know why if I type:

apt-get upg<TAB>

I get:

apt-get upgrade

but if I type:

sudo apt-get upg<TAB>

I get:

sudo apt-get upgrade-from-grub-legacy

Answer 1

Found the solution. Some time ago, trying to make bash-completion work also for sudo, I added:

complete -cf sudo

to my .bashrc. Commenting it out makes my sudo apt-get autocomplete correctly.