Setting vm.swappiness=5 parameter in /etc/sysctl.conf (tried with space and without space multiple times) and doing (sudo) sysctl -p applies the kernel parameter without problem yet after reboot it always decides to go back to the stock 60; can’t see any dmesg messages about it. Would appreciate help; I also don’t know how to set sysctl to debug mode 
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You might want to review what was suggested for a similar issue an AskUbuntu https://askubuntu.com/questions/962634/how-to-permanently-change-swappiness
Nope… Not issue at hand sry… Mine is about the value just going back to 60 back even when everything is set up correctly.
I experienced the same problem after using Ubuntu 24.10 and found this related issue: Bug #2084376 “[Ubuntu 24.10 Oracular; systemd-sysctl service] Fi...” : Bugs : systemd package : Ubuntu
The file /etc/sysctl.conf is not processed anymore, you can simply add a new file in /etc/sysctl.d/ with vm.swappiness = 5.
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Thanks, worked. It’s dumb of the developers to remove the symlink though, in my opinion, especially since manually instructing sysctl to apply the parameters works flawlessly.
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I’m sorry, but why did you mess with that? Wouldn’t it be much easier, even better, to add more RAM?