Update to 2020.12.1 failed

[onlinegill (Sukhpal)]

Try following

Can't install homeassistant:2020.12.0

Go to supervisor than System than under Host System next to Ip address click change than expend IPV4 and change IP DHCP to static and under DNS server add google DNS : 8.8.8.8 Reboot HA and than update supervisor. than update Home Assistant to latest available version.