Please install the nvidia graphic driver:
sudo apt-get update
sudo apt install nvidia-driver-440;reboot and retest.
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https://bugs.launchpad.net/bugs/1876511
Title:
Ubuntu 20.04 HDMI
** Package changed: ubuntu => linux (Ubuntu)
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https://bugs.launchpad.net/bugs/1876511
Title:
Ubuntu 20.04 HDMI audio is unplugged
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