steeldriver, thank you. But
admin@CCD6:~$ sudo service networking restart
[sudo] password for admin:
stop: Unknown instance:
And Network Manager reappears. I began editing the Wired Connection to make it Manual, while during so, the computer glitched and a popup informing me that Ubuntu 12.04 suffered an Internal Error. I pressed "continue" and finished the edit, and saved it. I'm going to do a reboot now, see you on the farside.
admin@CCD6:~$ sudo service network-manager restart
network-manager start/running, process 12213