Please redownload and run the setup_lnx.sh file again. Let me know if your situation changes
I failed to mention that prior to installing the pre-compiled version I made an attempt to compile the source, which did not go well, to say the least. There were many errors, all of which related to a permissions problem on the chmod and one other command that I do not remember at this moment. When I issued the commands from the CLI that were in the .sh I received no errors. I am in the sudo group, ran the .sh without sudo (and with, but had to modify the .sh to do that), and when I ran the .sh without sudo I was never prompted for the sudo password, although that might have been because I had already supplied it in the same terminal session.
I mention all of this because I receive similar errors when I run the install script for the pre-compiled version, although I am able to run the qb64 program file without using the install script, at least for the first runs which have been successful.
I should also mention that I've tried logging out and rebooting, but still receive the same error on qb64 execution.