Upgrading linux kernel on Kimsufi

Hello everyone,

I use a Kimsufi server (for several years now), and the prioritised linux kernel on it is:
$ cat /proc/version
Linux version 3.14.32-xxxx-grs-ipv6-64 (kernel@kernel.ovh.net) (gcc version 4.7.2 (Debian 4.7.2-5) ) #1 SMP Sat Feb 7 11:35:27 CET 2015

I want to use a newer kernel because I recently upgraded to Ubuntu 22.04 LTS, and I want to use a newer version of Apache to serve pages (22.04 upgrades to 2.4.52), and without a newer kernel, I get a:
(38)Function not implemented: AH00141: Could not initialize random number generator
since Apache started relying on the getrandom() syscall newer kernels provide.

I tried disabling the old kernel:
chmod -x /etc/grub.d/06_OVHkernel
update-grub
reboot

but then lost connection to the machine after reboot and the on-site team had to intervene (thanks OVH, and sorry!). They responded:

The server has started (login is requested on the screen) but inaccessibleby the network (not pinging).

I'm currently on rescue mode and reverted the changes.
1. How do I exit rescue mode? My Kimsufi dashboard doesn't have a button for this.
2. Can anyone please advise how to set up the new kernel?
Maybe there are some configurations the OVH kernel presets by default that I should change manually when I disable it.

Happy to provide more info, I just need to know what it is (and how to find it)!
Ohad.

I've asked in a ticket, and support helpfully answered:

> you can put your server into standard boot by choosing Netboot option in your customer panel and then choose boot from hard drive.

So that answers (1) above. Now that I know how to put the server in and out of rescue mode, I'll play around and try to work (2) out, but if anyone actually knows, please let me know!

Did you get any anwser to question 2?

I was not able to fix it in the time I have available.
I've migrated my web-served pages away from that machine, and my plan is to try a fresh reinstall of the machine when I have a little more time on my hands.