Command not found despite having just installed it?

As you can see in the screenshot below, I install a command (it's a wrapper for a program called qsiprep), and then try running it, but it says it's not installed...any ideas as to what is happening? I believe it may have something to do with my Python bin not being on the path. That's all I could find on the net for searching this problem up. But I'm not exactly sure what it means...I can run python just fine, is the python bin separate from python? Edit: the output from `find / -name 'qsiprep-container' is find: ‘/lost+found’: Permission denied find: ‘/usr/src/evdi-5.2.14’: Permission denied find: ‘/snap/core18/1705/etc/ssl/private’: Permission denied find: ‘/snap/core18/1705/root’: Permission denied find: ‘/snap/core18/1705/var/cache/ldconfig’: Permission denied and many similar messages, all ending in "Permission denied." What should I be looking for here? If I instead append the command with sudo, only one line is output: find: ‘/run/user/1000/gvfs’: Permission denied