I don't know if it is the right place to report here but:
A few shortcuts are not working and have been confirmed on other linux builds by other users (
https://forum.cockos.com/showthread.php?t=214498)
I cannot bind shift+space to any action (not recognized)
also I cannot bind any additional mouse buttons; in my case button 8 and 9 (they are recognized when running xev).
I am running ubuntu 18.04