Everyone has their favorite Linux distro and mine happens to be Ubuntu. After years of using the OS, I appreciate the ease with which I can run lots of applications that I can't run on other platforms, Ubuntu's security, and more. I also have a long wish list of things that I wish Ubuntu could do better.
If you have a similar wish list, you may want to keep track of Canonical's UbuntuBugDays and Hug Days. The next Hug Day is Thursday of this week, and is a community event that anyone can participate in, but Canonical is also serious about inviting developers to find meaningful bugs in Ubuntu.