[arch-general] `base` group replaced by mandatory `base` package - manual intervention required

[Jonathan Steel]

I think we should have created a "minimal" group rather than repurposing
the base one. Then as a separate issue to tackle, add "kernel" and "editor"
etc to the base group which would prompt the user to choose, or if
non-interactive install the first listed.

-- 
Jonathan Steel
Trusted User