Mobile Broadband in Ubuntu-MATE 18.04.2

Support & Help Requests
#1

Mobile Broadband connection in Ubuntu-MATE 18.04.2 (inside Network Manager) couldn't Resolve domain. But Wifi runs smooth.
Does anybody here know how to fix this annoying bug?

#2

still no luck :frowning:

#3

Might want to have a look here

#4

Thanks alot @LordBoltar for this very very nice Information :heart_eyes: