It appears you don't have the official Nvidia driver installed, which
should avoid the problem. Please try installing it:
sudo apt install nvidia-driver-390
** Package changed: xorg (Ubuntu) => ubuntu
** Changed in: ubuntu
Status: New => Incomplete
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You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1793607
Title:
GPU Overheats and laptop shuts off
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https://bugs.launchpad.net/ubuntu/+bug/1793607/+subscriptions
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