Only administrators may run arbitrary commands as root with sudo (unless you reconfigure sudo to allow others to do so, of course). When you run commands with sudo, you put in your password, not the password of the user under whose identity you wish the command to run. The reason it's unnecessary to enable the root account is that, whether or not you do, you can still run commands as root with sudo. If you have enabled root login, then you should be able to use su to become root. Root logins are disabled by default on Ubuntu, and there is only rarely any reason to re-enable them. If you want to run irssi as root, su is not the way to do it.
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