Upgrade to 12 failed - etc/hosts problem

[SebastianK1]

>>>
Trying to resolve hostname 'ip6-allrouters123.123.123.123' and validate its IP address...
Unable to resolve host name.
Please specify the host name in the /etc/hosts file or specify DNS configuration in the /etc/resolv.conf on your system.
<<<

123.123.123.123 is my IP

etc/hosts look like this:

>>>
127.0.0.1 localhost

# The following lines are desirable for IPv6 capable hosts
::1 localhost ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters123.123.123.123 mydomain.com mydomain
<<<

mydomain is the domain.
Where should the line part "123.123.123.123 mydomain.com mydomain" be? On top or bottom down?

Best,

Sebastian

 

[IgorG]

Put it after

127.0.0.1 localhost