Installation of PRANK MSA in WLS Ubuntu 20.04 LTS
Their instructions are outdated and don't match what exists on their server. The problem you're running into is not at the cd step but even before that - at your first step even. Your wget fails because that file does not exist. Go to http://wasabiapp.org/download/ and see for yourself - there is no /prank/ directory in there.
I tried using curl, and it wrote the 404 page as a .tar.gz file, so if you did that, the tar step would error out.