Could not set DHCPv4 route: Nexthop has invalid gateway. Network is unreachable
I found adding "critical: true" in file: /etc/netplan/00-installer-config.yaml ensure that the interface did not regularly go down (seems like an issue with IONOS). The file should look like:
# This is the network config written by 'subiquity'
network:
ethernets:
ens192:
dhcp4: true
critical: true
version: 2
then run:
$ sudo netplan generate
$ sudo netplan apply
this should help with any network dropouts.