I have Ubuntu 18.04.2 and I tried to install my printer Samsung M2070 following this list of commands found on this tutorial (that is unfortunately in Italian):
sudo apt update
sudo apt upgrade
sudo apt install suldr-keyring
Then I used this page in order to look for the name of my printer and find my driver version. Then i typedd in terminal:
sudo apt install suld-driver2-<version>
Now I can see my printer in the printers application and if I try to print a pdf file I have the possibility to choose my printer. However it is not printing and it is like the printer didn't receive the "print" signal.