Hi, TL;DR: If you're running in 32-bit PV mode you should not try to update your kernel to version 5.9 or beyond, which means not to Debian 11. Take some action first, like switching to PVH mode. Otherwise it will not boot and you'll have to boot into the older kernel again. During this week's maintenance a worrying number of customer VMs didn't boot because they were 32-bit PV and had been updated to a kernel version of 5.9 or beyond. Debian 11 (bullseye) has kernel version 5.10. It's been mentioned a number of times here over the years that support for 32-bit PV in the Linux kernel was going away at version 5.9, but it looks like we haven't been able to communicate that as well as we would have liked. The most recent attempt was here: https://lists.bitfolk.com/lurker/message/20210930.104643.2ab5f9c0.en.html If 32-bit PV is you then probably what you want to do is just switch to PVH mode as mentioned at the top of that email. Possibly the remaining people who need to see this just aren't on the announce@ list. We could email every customer who is running 32-bit PV mode, but it would probably just serve to annoy those of you who are never planning to update your kernels. Finally, although switching to PVH should allow you to continue for many years to come, nobody should be running 32-bit. We strongly advise you to be planning your switch to amd64 as soon as possible [advice since 2015]. Cheers, Andy -- https://bitfolk.com/ -- No-nonsense VPS hosting