I made the decision to upgrade from 14.04 to 15.04 via 14.10 as I'd been having a few issues with 14.04, so I ran the command
sudo do-release-upgrade. All seemed to go well, until tried to connect to wifi. I got the error Connection activation failed, so I tried a wired connection and got the same error. The question has been asked before but the answer did not work for me.
Here is what I have tried
usermod -G netdev -a jack log out, log in.. reboot etc lots of times as root and as my user.
nmcli dev wifi connect [wifi-name] pasword [password] using the correct credentials obvs.
nm-applet as root
Removed the ssid as root with
I cannot find any other help for this. I cannot now upgrade further to 15.04. There is nothing in syslog in regards to network only mysqld error entries. Im at my wits end with this problem, I really dont want to have manually install 15.04 from .iso as I now only have internet on my mobile....