I just discovered a simple workaround for the problem: disable the splash screen (System Settings -> Workspace Theme -> Splash Screen -> Set Theme to "None").
Now the KDE Desktop shows instantly after I login and everything is working immediately (including the network). Could this be a problem with the Breeze Splash Screen Theme? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1584604 Title: Slow login to kde5 waiting on ?networkmanager To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/plasma-nm/+bug/1584604/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs