After the kernel update I was able to shutdown succesfully two times. Without taking any further chances I'm now stuck at the poweroff again. I only see the blinking cursor on the top right corner that normally apears before the splash screen shows up. Seems to be another poweroff bug.
@Sebastian Thürrschmidt: Thanks for the clarification -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1724317 Title: Shutdown hangs / no standby - possible Wifi-bug in the kernel To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1724317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs