"Unable to determine DNS management tool." under KDE Neon(based on Ubuntu 16.04)

Probably related to #117 #128

Console

> python3 updateHostsFile.py --replace
Do you want to update all data sources? [Y/n] n
OK, we'll stick with what we've  got locally.
Do you want to exclude any domains?
For example, hulu.com video streaming must be able to access its tracking and ad servers in order to play video. [Y/n] n
OK, we'll only exclude domains in the whitelist.
Success! The hosts file has been saved in folder 
It contains 35,997 unique entries.
Moving the file requires administrative privileges. You might need to enter your password.
Attempt to flush the DNS cache? [Y/n] y
Flushing the DNS cache to utilize new hosts file...
Flushing the DNS cache requires administrative privileges. You might need to enter your password.
Unable to determine DNS management tool.

[gfyoung]

Ah, I see. As for your patch, it needs to be slightly more robust than that for general use. I think I know what can be done.

[Vdragon]

Yep.

(shell) python3 updateHostsFile.py --noupdate --replace
Do you want to exclude any domains?
For example, hulu.com video streaming must be able to access its tracking and ad servers in order to play video. [Y/n] n
OK, we'll only exclude domains in the whitelist.
Success! The hosts file has been saved in folder 
It contains 35,997 unique entries.
Moving the file requires administrative privileges. You might need to enter your password.
[sudo] password for <username>: 
Attempt to flush the DNS cache? [Y/n] y
Flushing the DNS cache to utilize new hosts file...
Flushing the DNS cache requires administrative privileges. You might need to enter your password.
Flushing DNS by restarting NetworkManager succeeded
Flushing DNS by restarting networking.service succeeded
(shell)