Getting Started: Suggestion to use official prebuilt binaries (at least for SBCL) than the distro

In particular, the SBCL distributed with Ubuntu 18.04 repository does not show line numbers on errors. I don't know how I lived without them until this point - line numbers as good error reporting was brought up in a compilers course we are having.

On a brief search, I came across this stackexchange question concerning better error reporting with SBCL. The suggestion is to use "non-customized" binaries and

(sb-ext:restrict-compiler-policy 'debug 3)

At this point, I found roswell not too smooth - it does say it is in beta - and hence unsuitable for beginners. Even with SBCL binaries, not all work on all versions (of linux). For instance, with the library versions available from the repository, on Ubuntu 18.04, I cannot run beyond sbcl-1.5.5 owing to glibc version limitations.

Mentioning these things should help speed setting things done more.

Start by locating the Getting Started material and review how it currently describes installing Common Lisp implementations. Check the SBCL, Ubuntu 18.04, Roswell, binary, and glibc details in the issue, then update the guidance so beginners can choose an appropriate installation path and understand the stated limitations.