Upgrade to v3.38, fails to start

Have been running gluetun successfully for months. Docker container on arm64, VPN provider Mullvad. No tags used in docker-compose.yml Recently pulled latest image, failed repeatedly on startup. Reverted to :v3 and :v3.37, same error as below...

Running version v3.37.0 built on 2024-01-02T00:01:06.245Z (commit c826707)

🔧 Need help? https://github.com/qdm12/gluetun/discussions/new
🐛 Bug? https://github.com/qdm12/gluetun/issues/new
✨ New feature? https://github.com/qdm12/gluetun/issues/new
☕ Discussion? https://github.com/qdm12/gluetun/discussions/new
💻 Email? quentin.mcgaw@gmail.com
💰 Help me? https://www.paypal.me/qmcgaw https://github.com/sponsors/qdm12
2024-04-01T12:34:00-04:00 INFO [routing] default route found: interface eth0, gateway 172.18.0.1, assigned IP 172.18.0.11 and family v4
2024-04-01T12:34:00-04:00 INFO [routing] local ethernet link found: eth0
2024-04-01T12:34:00-04:00 INFO [routing] local ethernet link found: eth1
2024-04-01T12:34:00-04:00 INFO [routing] local ipnet found: 172.18.0.0/16
2024-04-01T12:34:00-04:00 INFO [routing] local ipnet found: 192.168.92.0/24
2024-04-01T12:34:00-04:00 INFO [routing] local ipnet found: fe80::/64
2024-04-01T12:34:00-04:00 INFO [routing] local ipnet found: fe80::/64
2024-04-01T12:34:00-04:00 INFO [firewall] enabling...
2024-04-01T12:34:00-04:00 ERROR enabling firewall: accept output from fe80::42:acff:fe12:b to fe80::/64: ip6tables is required, please upgrade your kernel to support it
2024-04-01T12:34:00-04:00 INFO Shutdown successful

Base OS is Ubuntu server 20.04. I did do an apt update/upgrade before pulling the new image. There were multiple docker and docker compose updates, so perhaps one of these broke compatibility. I have no need/desire to use ipv6, so I tried disabling it in the OS, but I still got the same error message when I restarted gluetun. I have no idea what to try next, any help is appreciated.

Thanks.

qdm12 / gluetun-wiki

Upgrade to v3.38, fails to start #60