I am looking for a small (Ubuntu) open-source-project for which I can code

I good place to start is the One Hundred Paper Cuts project.

Aside from recommending any specific Project, keep this in mind:

With open source software,

• You don't need to ask permission from anybody to

  • download source code
  • modify it
  • re-distribute your modified versions

  As long as you follow the terms of the License.

Many projects are apprehensive of accepting new members before they have contributed in some way; therefore, it's best to just start doing stuff and worry about the projects after you've done something. If your modifications are significant, make your work known on their mailing lists, forums or IRC channels. They will most likely help you out, getting to know the projects structure and development guidelines.

I absolutely agree with João Pinto's recommendation of the One Hundred Paper Cuts project, it's a fantastic place to start.

Another good place to start is to look for bugs that have been marked as easy to fix, using the bitesize tag.

Another opportunity is to look for an area where the linux ecosystem is lacking, and create a small application to fill the space. A good example of this is simple-scan. If you can create (a) small application(s) like this that improve the life of the wider community, it goes a long way.

I personally have a small game project in need of coders. If you are interested: Colonial The Game.

GNOME Love is also a good place for new contributors to start.