Installation issue on Mail-in-a-Box Version: v63

installation on Ubuntu 22.04LTS, getting issue on Mail-in-a-Box Version: v63
has been auto change in resolv.conf entry.

Contabo?

or some provider which does not offer IPv6?

Contabo has IPv6 support, you just have to ask support to enable it or manually enable it yourself.

No,
in house server. during installation resolver & dns automatic wipe.

I don’t think ipv6 is necessary. I have a few new instances without ipv6 and everything is installing without any problems

Installing MIAB on a home server is a very bad idea.