Tried again, but still the same... I'm using Linux Mint.
Here's some debug output from my console, but that does not look too helpful...
Set current directory to /home/toddy/downloads/flerp
Found path: /home/toddy/downloads/flerp/pocket-trials.x86
Mono path[0] = '/home/toddy/downloads/flerp/pocket-trials_Data/Managed'
Mono config path = '/home/toddy/downloads/flerp/pocket-trials_Data/MonoBleedingEdge/etc'
Preloaded 'ScreenSelector.so'
Display 0 '0': 2880x1620 (primary device).
Logging to /home/toddy/.config/unity3d/Editor/Player.log
The key you just pressed is not recognized by SDL. To help get this fixed, please report this to the SDL forums/mailing list <https: discourse.libsdl.org=""></https:> X11 KeyCode 151 (143), X11 KeySym 0x1008FF2B (XF86WakeUp).