Ubuntu – (K)Ubuntu 16.04 Plasma 5.5.5 takes long time at login


My new installed Kubuntu 16.04 with Plasma 5.5.5 takes very long time at login(~30s).
I read about a similar bug https://bugs.launchpad.net/ubuntu/+source/plasma-nm/+bug/1509334 , but I don't think this match my problem. Does anybody have similar problems?
System: Dell Latitude E7440 with WLAN and Bluetooth.

Edit: I think that the desktop is loaded while the KDE login wait-bar is on the screen. When I'm clicking ALT+TAB to switch between applications, it is possible to see the desktop for that moment.

Best Answer

There is a workaround to avoid this problems: "disable the splash screen (System Settings -> Workspace Theme -> Splash Screen -> Set Theme to "None")" (see https://bugs.launchpad.net/ubuntu/+source/breeze/+bug/1584604/comments/14). The bug seems to caused by breeze.