[Merge] ~osomon/software-properties:updates-refresh into software-properties:ubuntu/master

[Olivier Tilloy]

Note that when some components are inconsistently disabled in e.g. the release pocket, the corresponding checkboxes on the first tab ("Ubuntu Software") should be unchecked.
So in fact the user has a way to fix their sources.list by checking those checkboxes again.
-- 
https://code.launchpad.net/~osomon/software-properties/+git/software-properties/+merge/379345
Your team Ubuntu Core Development Team is subscribed to branch software-properties:ubuntu/master.