[Ubuntu 20.04] What to do if the external monitor is not recognized

environment: Clean install Ubuntu 20.04 on ASUS laptop (minimal installation) The display was not recognized when trying to connect to HDMI from the type-c dock

install lightdm

Install the display manager Light DM.

Do the following in your terminal:

$ sudo apt install lightdm

Register LightDM with your default display manager.

Restart your PC.

nvidia installation

Execute the following command in the terminal.

$ sudo apt-get purge 'nvidia*'
$ sudo add-apt-repository ppa:graphics-drivers
$ sudo apt-get update

When you restart your PC, HDMI will recognize and use your external monitor.

reference

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