Comment 8 for bug 2034705

On the off chance that this issue has a broader impact I will leave a reference to https://answers.launchpad.net/ubuntu/+question/708251 wherein similar behaviours are being observed with 6.5.0-9-generic on amd64.

efivar -l returns: "efivar: error listing variables: Function not implemented", yet `ls /sys/firmware/efi` returns entries.

I noticed this after upgrading from Ubuntu 23.04 when efibootmgr stopped working.

Ubuntu 23.10 x86_64, 6.5.0-9-generic (Plasma 5.27.8 if that makes a difference).

Happy to provide any other info on request.