I confirm hibernate is working with 5.11.0-26.28 kernel.
It does work on 5.11.0-24 too, but I'm having another issue with it: the nvidia driver does not work, since the package linux-modules-nvidia-390-5.11.0-24-generic is missing from the repositories.
I confirm hibernate is working with 5.11.0-26.28 kernel. nvidia- 390-5.11. 0-24-generic is missing from the repositories.
It does work on 5.11.0-24 too, but I'm having another issue with it: the nvidia driver does not work, since the package linux-modules-