Hi,
I'm not very well versed in LINUX but this person appear to have the same error and more when googling it.
There were no errors when the build was made so I think one of these should help!
https://answers.unity.com/questions/404131/how-to-run-the-exported-game-on-ubuntu.html
https://askubuntu.com/questions/254220/there-is-no-application-installed-for-executable-files