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How to install NVIDIA.run?

hello everyone I am new in ubuntu and i really like it's too comfortable for any H/W but i have problem in it i want to install graphic driver of nvidia geforce 610m series. I already use these command

  1. cd 'path of my removable drive'

  2. chmod -x nvidia.run

  3. sudo ./nvidia.run

after run these command my terminal show

sudo:./nvidia.run : command not found

please help me

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