It is a known issue of NOUVEAU.
Please use "safe graphics" to boot and install Ubuntu on usb disk.
After installation, please add "nouveau.modeset=0" in kernel cmdline if you
still have issues.
Then install nvidia-driver-440, graphics and HDMI will be good.
** Changed in: linux (Ubuntu)
Status: Confirmed => Triaged
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https://bugs.launchpad.net/bugs/1874624
Title:
Unable to boot 20.04 LTS installer on Dell XPS 15 9560
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