Normally I'd include instructions in an answer, but this is such a bad idea I'll point you to a couple places to read up on how to do this. You can take it from there. Note that when you break your system you can post here again for help, but people will laugh and shake their heads and make reference to pebkac errors, etc.

First, the Ubuntu help page on Root/sudo. Note the three large, prominent warnings.

Here's an Ubuntu Forums user that did something like this and couldn't fix their system.

Keep backups of your data if you do it, and consider the wisdom of trading security for convenience. Maybe put on an old Dead Kennedys album while you reinstall...