I can live with this little work-a-round... No big deal...
I',m still not convinced it's a bug... Because I am installing the exact same version of QB64 on my new OS install. Logic dictates that, if QB64 has not been updated within the last two weeks; The same version of QB64 worked without error on my previous version of Linux Mint; The same version of QB64 has a problem with the 'keyword index' and the 'keyword index' is included in the installation, then the most likely source of not accessing the 'keyword index', may lie within the new OS install.
So as to eliminate the obvious flaw in this logic... Has QB64 been updated within the last two week?