I've been using various versions of Ubuntu as diskless workstations (PXE boot) for a while (8.10 - 15.04), I'm actually a co-author of this page.
Now I experience weird issue with Ubuntu 16.04. It hangs the system completely when I switch to virtual consoles (CTRL-ALT-Fx). There's no chance to SSH to it. It happens both when I upgrade from 15.04 to 16.04 or when I use clean installation.
it does NOT happen on normal 'disk' installations where system is running from a hard disk. I can freely switch between GUI and virtual consoles.
it does happen after the system boots and login manager is shown. I can sign-in, everything looks OK in X except for switching to virtual console or shutting down the system (it closes the GUI, switches to the console and freezes)
- Intel Core i5-4590
- integrated graphics
- 8GB RAM
- no disk