Originally Posted by pljvaldez
If you're using Ubuntu, try sudo dpkg --configure -a and enter your user password. If you're using Debian or another distro, you need to open a root shell or type su and enter the root password.
Just a small correction: you can use sudo on debian also, in fact I've been doing that for years. sudo is installed by default on all the Debian flavours I've looked at so far.
It's a minor point but pointing this out could avoid some confusion.