Thank you for reporting this. There are many variants of Linux which makes it difficult to test, and this is the first report we've had of this, so we'll look into it !
My distibution is Fedora.
Possibly the same issue running it on Arch. Here's the error I get when I run the Appimage:
/tmp/.mount_aerifoIPR5Ef/tape: error while loading shared libraries: libgtk-x11-2.0.so.0: cannot open shared object file: No such file or directory
