In the Network Manager applet on Ubuntu 14.04 LTS I have an extra item called 'Xperia Z Network' with the network name 'Xperia Z' and a greyed out status 'disconnected'. Unfortunately I can't take a screenshot of the applet (it closes if I press print screen). This item is between 'Ethernet Network' and 'Wifi Networks'.
If I click on 'edit connections' the item is not there and there is no network by the same name to remove.
I do own an Xperia Z, so it somehow made a connection with it once. But the menu item remains there even if the phone is powered off and ubuntu rebooted. Also the only connection I ever made with the phone is by setting up a tethered hotspot from my phone, with a different name.
So why is the item in my Network Manager and how do I get it to go away and not reappear.
First, try "Edit connections..." from the Network Manager applet. If the connection does not show up in the list, or cannot be removed from the list, find the corresponding file in
/etc/Network Manager/system-connectionsand remove it.