Using Fedora33 rn, tried to install Postgresql, was succesful initializing first db, haven't got any errors. Also installed pgadmin4 but couldn't create a server.
su -i -u postgres -c "psql"
tried this command and got: `
psql: /usr/pgsql-11/lib/libpq.so.5: no version information available (required by psql)
psql: /usr/pgsql-11/lib/libpq.so.5: no version information available (required by psql)
psql: symbol lookup error: psql: undefined symbol: PQgssEncInUse, version RHPG_10
tried reinstalling as mentioned and pg_ctl: error while loading shared libraries: libpq.so.5 but didn't work either.
You have some PostgreSQL packages installed from the Redhat repository and some from the PGDG repository. They don't play together nicely. Don't do that.
The best solution is to uninstall all PostgreSQL packages from the Redhat repository.