Ran into this issue today and found out why the privacy settings in /etc/sysctl.d/10-ipv6-privacy.conf are getting ignored - they're being overwritten by /etc/sysctl.d/99-cloudimg-ipv6.conf.
Ran into this issue today and found out why the privacy settings in /etc/sysctl. d/10-ipv6- privacy. conf are getting ignored - they're being overwritten by /etc/sysctl. d/99-cloudimg- ipv6.conf.