Has there been a recent sale of your notebook model?
The problem is, Ubuntu 20.04 has a bug so it won’t work on your
Dell G3 3590
Please install Ubuntu 18.04 which works fine though you will hit sound problems, can be mitigated to a certain degree, see this:
https://forums.developer.nvidia.com/t/ubuntu-20-04-init-i915-and-hdmi-codec-failed/123879/13
that user has the same model with same problems.
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