Ubuntu / MySQL - How to choose from the various downloads?
Well, I have some advice for you.

Given https://help.ubuntu.com/12.04/serverguide/mysql.html,


  As of Ubuntu 12.04, MySQL 5.5 is installed by default


Go with the 5.5.x version they supply, and update accordingly.

If you don't want to do that and really want 5.5.29 for a specific reason, go for mysql-5.5.29-debian6.0-x86_64.deb as Ubuntu was derived from Debian.

You may have to remove the version of MySQL that came with your ubuntu installation.