Ubuntu: Can't add NVIDIA apt-get repository


I can't add the needed repository to install nvidia-graphics-drivers-319. I don't understand why the key is not trusted. See the output of the needed commands:

root@barry-III:/home/zombie# add-apt-repository ppa:ubuntu-x-swat/x-updates   Updated versions of X.org drivers, libraries, etc. for Ubuntu.    This PPA is for stable upstream releases of X.org components.  If you're looking for something even more bleeding-edge, please see the xorg-edgers PPA.    While Ubuntu does not "officially/formally" support these packages, if you discover problems when installing these debs please feel free to report bugs to launchpad.  However, please make sure to clearly state that you are running packages from this PPA so we know the fixes need to come here.    If you are upgrading from one release to another with this PPA activated, please install the ppa-purge package and use it to downgrade everything in here beforehand. sudo ppa-purge ppa:ubuntu-x-swat/x-updates will do it.    [Directions for packaging drivers can be seen at https://wiki.ubuntu.com/X/DriverBuilding]   More info: https://launchpad.net/~ubuntu-x-swat/+archive/x-updates  Press [ENTER] to continue or ctrl-c to cancel adding it    gpg: keyring `/tmp/tmph015_y/secring.gpg' created  gpg: keyring `/tmp/tmph015_y/pubring.gpg' created  gpg: requesting key AF1CDFA9 from hkp server keyserver.ubuntu.com  gpg: /tmp/tmph015_y/trustdb.gpg: trustdb created  gpg: key AF1CDFA9: public key "Launchpad PPA for Ubuntu-X" imported  gpg: no ultimately trusted keys found  gpg: Total number processed: 1  gpg:               imported: 1  (RSA: 1)  OK  root@barry-III:/home/zombie# apt-get install nvidia-graphics-drivers-319  Reading package lists... Done  Building dependency tree         Reading state information... Done  E: Unable to locate package nvidia-graphics-drivers-319  root@barry-III:/home/zombie#   


It was not nvidia-graphics-drivers-319,it was nvidia-319.So run the below command,

sudo apt-get update  sudo apt-get install nvidia-319  


After adding the PPA run:

sudo apt-get update  

To reload the packages list and try again. Make sure the PPA contains packages for the ubuntu release you are currently using.

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