Ubuntu 20.04 Boot Fail after DisplayLink Driver Installed HP Spectre

I've been having the exact same issue on my new acer swift 3 notebook with an amd cpu/gpu. Besides the display link driver giving me a black screen of death the HDMI port on the notebook would also not work. I manged to get both working by doing the following:

Updating the kernel to 5.6.17 using the method described here: https://linuxhint.com/update_ubuntu_kernel_20_04/ ( I recommend the graphical updater )
Rebooting into the new kernel (important!)
Installing the display link drivers by using the unofficial installer available here: https://github.com/AdnanHodzic/displaylink-debian

I don't know how applicable this is to your issues tough. Because mine were mostly related to too modern hardware I guess.

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