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I tried to install Nvidia driver in my laptop, Acer V5, with Nvidia Optimus (Nvidia+Intel). I also tried to install nvidia-prime so the Nvidia graphics card can be used. After reboot, the screen resolution changed to 640x480. There is an option to change to 1366x768, but it didn't change after I pressed Apply.

Any help? I'm a newbie on Ubuntu.

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