Comment 2 for bug 885828

solution
Right click and exit qBittorrent
browse to home. Locate .config/qBittorrent/qBittorrent.conf. right click 'open with text editor'. Scroll to heading [Preferences]

change values of these lines to false as below..
General\SystrayEnabled=false
General\CloseToTray=false
General\MinimizeToTray=false
General\StartMinimized=false
save/c;ose
execute qBittorrent! :)