Install the following files
sudo apt-get install jbigkit-bin inotify-tools
Download the git files or clone form here https://github.com/madlynx/ricoh-sp100
Extract the zip file in a folder
Copy the following file
sudo cp pstoricohddst-gdi /usr/lib/cups/filter/
Now change the permissions
sudo chown root:root /usr/lib/cups/filter/pstoricohddst-gdi
Add Printer > Choose Ricoh SP 111 > Model > Provide ppd file (RICOH_Aficio_SP_111.ppd)
Another method
To add printer from the ppd file: In your web browser, navigate to http://localhost:631/CUPS for Administrators > Adding Printers and Classes Printers > Add a printer Enter your root username and password