Kubuntu Trusty Tahr (14.04 tobe):

After adding a new repository and update pkg list, muon did not find pkgs from the new repository.
Stop and start muon again, search again, and now the pkg was found.

Reproducible: Always

Steps to Reproduce:
1. make sure virtualbox.org repository is not already included
2. add deb http://download.virtualbox.org/virtualbox/debian saucy contrib  repository with settings -> add software sources
3. Click 'check for Updates'  to update the pkg list
4.  Search for virtualbox-4
Actual Results:  
nothing is found

5. restart muon, search for virtualbox-4 again.  Now found pkgs are:
virtualbox-4.3
virtualbox-4.2


Expected Results:  
should find the pkgs of an added repo after an update pkg list was running without restarting muon