[Merge] ~roxanan/ubuntu/+source/systemd:5.15.0-bt-sysctl-issue into ~ubuntu-core-dev/ubuntu/+source/systemd:ubuntu-focal

[Nick Rosbrook]

Review: Approve

This does match what we have in jammy and newer, and matches https://github.com/systemd/systemd/commit/0af05e485a3a88f454c714901eb6109307dc893e.

We will want to bundle some other changes in with a focal SRU, but I think this should be included. Please fill out the SRU template on the bug report.
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https://code.launchpad.net/~roxanan/ubuntu/+source/systemd/+git/systemd/+merge/436747
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