Please redownload and run the setup_lnx.sh file again. Let me know if your situation changes
(3) executing the file from the console as "/usr/local/bin/qb64/qb64"This concerns me, because it suggests you've put qb64 into places only root should have access to.
This concerns me, because it suggests you've put qb64 into places only root should have access to.
QB64 best lives in your home directory, say ~/qb64 or maybe ~/programming/qb64.
sudo chmod a+rwx /home/user/progams/qb64
@paranoia1001001
Try running this command in your terminal
Try to change directory to /home/user/programs/qb64/ and then run the setup script. The error messages look like a path problem.