Gpio on ubuntu 18.04/server ?

how can I use the gpio after install a fresh and clean iso again?

You'll more than likely need to copy the missing files from an image, extract the image from the zip file and mount it on a another Linux box.
Maybe this Image:
http://www.dlifiles.com/api/atomicpi_ubuntu_bionic_bare_1.0.0.138.zip
Hints here for mounting:
https://major.io/2010/12/14/mounting-a-raw-partition-file-made-with-dd-or-dd_rescue-in-linux/
Files you'll need are here.
https://www.digital-loggers.com/downloads/atomicpi_readme.txt

sudo apt-get install dkms
Should install the tools you need.....you will also need the corresponding kernel-headers
Info on using dkms to install & build packages.
https://www.linuxjournal.com/article/6896

This should get you on your way.

thanks :)