Nvidia quadro p4000 driver not installing in ubuntu 18.04

DEAR NVIDIA TEAM,
WE PLACED 2 NVIDIA QUADRO P4000 GRAPHIC CARDS IN DELL R740XD SERVER UBUNTU 18.04.1 OS INSTALLED .BUT WE ARE UNABLE TO INSTALL NVIDIA DRIVER HAVING ERRORS PLEASE GIVE STEPS.
HOW TO CHECK DRIVERS FULLY INSTALL OR NOT ?
HOW TO REMOVE OLD DRIVERS AND INSTALL NEW DRIVERS USING DVD OR PENDIVE .STEP BY STEP.

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Log in to Ubuntu desktop, start “Software&Applications”->additional drivers->nvidia driver.

“WE NEED TO CONNECT INTERNET OR NOT”.
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I AM NEW TO LINUX. I DONT KNOW COMMANDS ALSO .PLEASE GIVE EASY INSTALLATION STEPS

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