Btw. yes, 2GB is fine for smaller Ubuntu systems I even have some 1GB
systems over here, but mainly in VM and KVM - so we indeed have such
small systems for some tests or for just trying out certain aspects and
functions as well.

A good common sense is to just select in d-i the min. required stuff for the 
initial setup and install anything else on top of that after the initial setup 
got completed.
It provides also a better user experience due to the more convenient package 
mgnt tools.

It is not really possible to estimate the required RAM if installing all
of the archive options, because the services are started upon
installation. And they may even have different requirements that change
from version to version.

The disk space estimation can also only be done quite roughly and is based on 
the package unpacked size. But keep in mind that postinst package scripts may 
create more files that again consume more disk space.
For example postgresql create and starting new clusters,
or backups and snapshots are taken
which at the end can eat a lot of space in /var.

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https://bugs.launchpad.net/bugs/1692911

Title:
  Installation with many package groups selected is not possible

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