17.09.2019 04:11, Matthew Garrett пишет:
> In one case we have "Systems don't boot, but you can downgrade your
> kernel"

You can't. There are way too many dedicated server providers where there 
is no IPMI or any equivalent, and the only help that the staff can do is 
to reinstall, wiping your data.

-- 
Alexander E. Patrakov