Welcome to RR2!
We love RA2! A lot of the of the original RR2 community migrated over from the old RA2 forums a few years ago as RR2 gained traction.
I'm sorry to hear that you are having trouble with the Linux version. Unfortunately we currently don't currently have an active member of the dev team for linux. The best I can recommend is to head over to the Discord server to see if the community has a fix. We also have a more recent build available there at the moment which might possibly address the issue.