By default Ubuntu uses the open source Radeon driver for cards manufactured by AMD. However, the proprietary fglrx driver (known as AMD Catalyst or AMD Radeon Software) is made available for those who would like to use it.

How do I enable my AMD graphics card Ubuntu?

Setting the AMD Radeon graphics card in Ubuntu

1. Once there select the option “Using video driver it graphics accelerator from AMD fglrx-updates (privative)”:
2. We asked for the password:
3. After installation it will request reboot (it is sufficient to restart the X server). …
4. With the external monitor you click on its icon:

Does AMD Radeon work with Linux?

AMD Radeon RX 5700 XT

Best of all, as it is a Radeon, the Linux kernel supports it with open-source graphics drivers, and there is no need to fiddle with it to get it to work on even the most obscure distributions!