Please:

  sudo apt install openssh-server

so that you can log into the machine before/while the lid is closed.

Then while the lid is closed and the machine overheating, please run:

  top

and tell us what process is using the most CPU? Or just take a
screenshot.

** Package changed: xorg (Ubuntu) => ubuntu

** Changed in: ubuntu
       Status: New => Incomplete

-- 
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/1837453

Title:
  18.04 overheating at lock screen or closed lid

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