Dell Proximity Printing Solution - Manual (Page 9)

9 DPPS – Installation Guide
17 Type the following in a new line after the commented lines:
127.0.0.1 localhost
This forces the server to look at the DNS settings for DNS information,
allowing a more dynamic setting.
18 Save the document and exit GEdit.
19 Type the following command in a terminal window:
hostname -f
If this command does not return the FQDN, contact Dell Pro-Support
for assistance.
20 Restart Ubuntu.
21 Verify that your settings are retained. If the settings are lost, contact Dell
Pro-Support for assistance.