It appears you're just missing a driver for the Nvidia RTX 3060 Mobile
chip (which is what external monitor connectors are usually wired to).
Please open the 'Additional Drivers' app and install the latest Nvidia
driver.
** Package changed: xorg (Ubuntu) => ubuntu
** Changed in: ubuntu
Status: New => Invalid
** Tags added: nvidia
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https://bugs.launchpad.net/bugs/1947826
Title:
External monitor stopped working after update
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