- Are you on stable or unstable ?
- Are you fully updated ?
- Which DE ?
- What error do you get on command line when launching ?
- What error do you get while trying to reinstall ?
EDIT: on closer look, it seems that running sudo eopkg it keybase
installs the package and all its dependencies but the run_keybase binary in /usr/bin has the wrong permissions. sudo chmod +x /usr/bin/run_keybase
fixes the issue, but it should be properly fixed by the package maintainer.
EDIT 2: there's now an open issue for this, let's wait for the fix.