Default configuration:
 - network-admin says "Location: [empty box]"
 - Connections tab:
   - Wired connection is listed as 'roaming mode'.
 - General tab:
   - I have a host-name ("deacon"), but no domain name
 - DNS tab:
   - I have a DHCP-allocated DNS server, but no search domains.
 - Hosts tab:
   - "127.0.1.1: deacon.thristian.org deacon.thristian.org"
   - The usual loopback entries.

"time xterm -e ls" reports 10 seconds elapsed.

I edit the configuration:
 - General tab:
   - I fill in the hostname "thristian.org"
 - Hosts tab:
   - I change the aliases for 127.0.1.1 to "deacon.thristian.org deacon"
 - I save these settings as a new location, "home-test" and click Apply.

"time xterm -e ls" reports 0.1 seconds elapsed.

I open network-admin again:
 - "Location:" has reverted to an empty box.
 - Hosts tab:
   - 127.0.1.1 has reverted to "deacon.thristian.org deacon.thristian.org"

"time xterm -e ls" still reports 0.1 seconds elapsed.

I reboot the laptop.

"time xterm -e ls" reports 10 seconds elapsed again.

I open network-admin again:

 - "Location:" has reverted to an empty box.
 - General tab:
   - Domain name has reverted to an empty box.
 - Hosts tab:
   - 127.0.1.1 has reverted to "deacon.thristian.org deacon.thristian.org"

I choose "home-test" from the location drop-down, and click Apply.

"time xterm -e ls" reports 0.1 seconds elapsed.

On the Connections tab, I select "Wired connection", click Properties, disable
Roaming Mode and set the configuration to DHCP. I set up the General and Hosts tabs, then re-save this as the "home-test" location and restart the laptop.