not sure quite what happened in my case, but I tried copy/pasting that first part into root bash shell and it literally wiped out most of my /etc directory, including passwd files, /apt dir, etc - I think some of this was designed more specifically for the docker build (via the Dockerfile template), which is how I've been trying to rebuild EOS after recreating the VM. So far that's been working well. Probably safer though to execute one line at a time, and make sure each one does what it's supposed to...

https://github.com/EOSIO/eos/blob/master/Docker/Dockerfile