I can't seem to find any information about this rather annoying issue.
A user needs to do a few tasks which require a FTP program.
He or she opens the Application Catalog and installs the optional software FileZilla.
The next week the user uninstalls FileZilla from the Software Center, because he or she doesn't need it any more.
FileZilla jumps back to "Available software" in the Software Center and keep bugging the user every few hours or reboots that new software is available.
How do I clear the "Available Software" in the Software Center from optional software that has been uninstalled?