Ubuntu Focal freezes and does not resume after suspend (e.g. laptop close)

Solution 1:

This is (can be) a symptom of running Ubuntu in SecureBoot mode. See here for more detail.

According to this (at least as I understand it), your error message is telling you that hibernation is not allowed in your system, as it is trying to comply with secure boot standards.

To disable SecureBoot, you need to boot into the BIOS settings menu. The process for opening the BIOS menu and for locating this setting are machine dependant. If you do not already know the process, a quick google search of:

<laptop-make-&-model> BIOS settings

...will give detailed instructions. Substituting or adding the word "SecureBoot" will tell you where at in the menu the option is hiding, although it is usually fairly easy to locate. Often, it is located under a 'security' tab or somethinng similar.

As far as the nvidia card/driver, I am running the same setup, and the only issue I have come across was with sway, and that ended up being minor.