Ubuntu contributions are managed via the launchpad platform. Once you subscribe you can contribute checking out projects with bzr.

Ubuntu comes with a bzr “launchpad” plugin. You can register your ssh public key here

https://launchpad.net/~user/+editsshkeys

then join with:

#bzr launchpad-login user

Checkout your source project – eg u1ftp, the ubuntu one ftp gateway.

#bzr branch lp:u1ftp u1ftp-origin

Do your patch, commit and then push it!

bzr push lp:~rpolli/u1ftp/unicode_support