What has Jockey been replaced with in 14.04?

Open the terminal and type:

sudo apt install ubuntu-drivers-common

ubuntu-drivers-common detects and installs additional Ubuntu driver packages.

This package aggregates and abstracts Ubuntu specific logic and knowledge about third-party driver packages, and provides APIs for installers and driver configuration GUIs. It also contains some NVidia specific support code to find the most appropriate driver version (as Ubuntu usually ships several), as well as setting up the alternatives symlinks that the proprietary NVidia and FGLRX packages use.

Command line interface

The simplest frontend is the "ubuntu-drivers" command line tool. You can use it to show the available driver packages which apply to the current system (ubuntu-drivers list), or to install all drivers which are appropriate for automatic installation (sudo ubuntu-drivers autoinstall), which is mostly useful for integration into installers.

See also: Can I install extra drivers via the command prompt?

jockey has been superseded by software-properties in Ubuntu 14.04. Hence forth, software-properties would handle third-party driver configuration.

Sources: launchpad jockey-gtk amd64 and launchpad jockey-gtk i386.

software-properties-common available here packages.ubuntu.com and others available here.