Fix: Warning: Extension conntrack revision 0 not supported, missing kernel module?

[0xlua]

Hi,

I recently encountered this error and just wanted to share my fix, in case someone else comes across this.
This happened on MicroOS with gluetun running in podman.
Gluetun was running fine before and then stopped working with this error message:

ERROR enabling firewall: command failed: "iptables-nft --append OUTPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT": Warning: Extension conntrack revision 0 not supported, missing kernel module?
Dec 18 08:09:46 ganymede systemd-gluetun[5129]: iptables v1.8.9 (nf_tables):  RULE_APPEND failed (No such file or directory): rule in chain OUTPUT: exit status 4

Since I did not change any config / gluetun didn't update but MicroOS auto-updates, I assume this was caused by a some package update, but I can't be sure.

Anyway:
To fix this I just added SecurityLabelDisable=true to my gluetun quadlet.
This comment was helpful to point me to the right direction: #1723 (comment)