Hi Nicoleto
What you need to look for with apt is the matching 'linux-headers' package that corresponds to your kernel.
I am on Ubuntu 22.04 and I can't find it for that version of kernel so you may need to do that upgrade first. I have a feeling that 5.11 version of the kernel was part of the 20.04 distro.
This is what apt tells me that I installed:
linux-headers-5.15.0-41-generic/jammy-updates,jammy-security,now 5.15.0-41.44 amd64 [installed,automatic]
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