Ubuntu 22.04 missing /proc/version_signature

Question

I run Ubuntu 22.04 on a Dell Latitude E7440

sudo pro status

WARNING:root:failed to process /proc/version_signature.
SERVICE          ENTITLED  STATUS    DESCRIPTION
esm-apps         yes       enabled   Expanded Security Maintenance for Applications
esm-infra        yes       enabled   Expanded Security Maintenance for Infrastructure
livepatch        yes       enabled   Canonical Livepatch service
realtime-kernel  yes       disabled  Ubuntu kernel with PREEMPT_RT patches integrated
Enable services with: pro enable <service>
[...]

uname -r

5.18.0-051800-generic

File /proc/version_signature is missing. File /proc/version exists.

How can I fix this problem?