$ sudo apt-get update
$ sudo apt-get install postgresql postgresql-contrib
$ sudo -i -u postgres
Now you can use psql
$ createuser --interactive
Enter name of role to add: lumen
Shall the new role be a superuser? (y/n) y
More info man createuser
createdb db_name --owner=lumen --locale=ru_RU.utf8 --template=template0
More info man createdb
You can list available locales with locale -a
template0 is used to bypass locale incompatible error