I am using Ubuntu 14.04 LTS. Since an update late yesterday, my wi-fi does not work. I receive the following message Under System Settings ==> Network "The system network services are not compatible with this version"
The wi-fi worked well previous to the update. Seems like the update had a problem.
The problem was at least partially corrected temporally by using the Advanced Features on the GRUB menu and pick the Network option. This must be done on each boot. I then ran Software Updater. It looks like the system update fixed this network problem,