Fix for boot failure with testing stream and 6.6.13-amd64 kernel

This is a post meant to help anyone who finds his/her system unbootable 
- as I did - after updating to the latest version of the testing stream 
which comes with a 6.6.13-amd64 kernel.

When I updated last week, my system refused to boot. Checking revealed 
that the system-load-modules service was missing.

I then checked to see if the linux-headers for this version had been 
installed.

root@zizyphus:~# dpkg -l | grep linux-headers-6.6.13-amd64

Turns out it has not been installed.

Installing it also brings along a couple of other packages; these three 
packages fix the issue and make the machine bootable again.

Sam
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(Sam Varghese)