pgcliis not even listed on 18.04
@fernandocanizo try 1)pip install --upgrade requests
2)pip install psycopg2-binary
3) pip install pgcli --no-binary :all: psycopg2
As a note the link to the google group https://groups.google.com/forum/#!forum/pgcli says "This group either doesn't exist, or you don't have permission to access it. If you're sure this group exists, contact the Owner of the group and ask them to give you access." cheers!
Echoing this; that group is either invite-only or dead