I built Guix 1.3.0 from source on Ubuntu 20.04 with help from Carl. It was built with Guile 3.

During the bootstrap it failed to build /gnu/store/2nvaxgs0rdxfkrwklh622ggaxg0wap6n-bash-mesboot0-2.05b.drv with "make: *** No rule to make target `bash'.  Stop.", after some warnings ("warning: no binary for interpreter `perl' found in $PATH").

I decided to run "make check" first before trying to debug the above. Most passed, except tests/pack.scm, tests/guix-git-authenticate.sh and tests/guix-pack-relocatable.sh. Zooming in on the first one, I ran that and attached the logs.