Welcome to Ubuntu. Give yourself some time to learn a new operating system. It comes with almost everything I needed. Have you gotten it to connect OK to the internet, wireless as well? I would start by just trying every program on the computer. There is also an Ubuntu forum, check you bookmarks in Firefox for Ubuntu and free software links. Ask you Mini questions here & Ubuntu questions there (here as well as several use Ubuntu). This has been a good forum for Mini related issues & well worth searching or just reading the topics that interest you.
I use an older version of Ubuntu (10.04 vs. 11.04) than you do. The next version will be out next month, 11.10.
How do you use you mini?