My wireless is a bit buggy on Ubuntu, every now and then the DNS will cut out for no reason, and I'll need to run `sudo restart network-manager` to actually fix it.

However I just upgraded to 15.04, and after experiencing the DNS problem again I tried to restart network manager- however, I was greeted with the error 
`restart: Unable to connect to Upstart: Failed to connect to socket /com/ubuntu/upstart: Connection refused`

I saw another AskUbuntu question which said the problem was related to systemd vs upstart, and that to fix I could reinstall upstart. I did so, using the command

`sudo apt-get install upstart-sysv`

However this did not seem to fix my not being able to restart network manager.

My question is twofold- if necessary, how can I roll back the changes I made to my system by installing upstart, and how can I make so that I can actually restart network manager?

Alternatively, I'd accept some help with solving my DNS errors, but historically no one has really been able to help me with that.