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I installed ubuntu from a live USB as dual boot alongside windows on a Razer Blade laptop. During installation an external monitor was plugged in the laptop. Now, the external monitor needs to be plugged in on Ubuntu start, otherwise Ubuntu crashes right after I enter my login password. Once Ubuntu is started I can use it normally, but if I click on the icon for system settings, it crashes. Also I can't turn off the computer from the top right menu, I can only turn it off by pressing on the power button for twenty seconds. What should I do?

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The solution was to reinstall 16.04 LTS, deactivate the nouveau driver by updating grub with "nouveau.modeset=0", then use a USB-C to HDMI dongle to plug in the external monitor in the thunderbolt port instead of the HDMI port.

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