[12:35] <BEC> Hi; how can I change an app icon in  unity (better in whole system)?
[13:35] <JanC> BEC: change (in '/usr/share/applications/') or override (in '~/.local/share/applications/') its .desktop file, or replace/override the actual icon
[13:35] <JanC> so, also depends on what you really want to do
[14:21] <BEC> JanC, oh thanks :) i used the 1st
[14:21] <BEC> it changed in the dash but not in the launcher though!
[14:21] <BEC> needs a reboot?
[14:22] <JanC> BEC: remember that the files under /usr might get overwritten on package upgrades
[14:22] <BEC> JanC, aha; what can I do to keep them?
[14:23] <JanC> and a restart of the session should be enough