systemd-* no more resolution after apt upgrade 20.04

[Poil]

When building an image, via Packer on Azure, based on official Ubuntu 20.04 "0001-com-ubuntu-server-focal" after apt-upgrading I have no more DNS resolution

If I mark as hold systemd systemd-* the resolution is OK

Before :

    azure-arm: Link 2 (eth0)
    azure-arm: Current Scopes: DNS
    azure-arm: DefaultRoute setting: yes
    azure-arm: LLMNR setting: yes
    azure-arm: MulticastDNS setting: no
    azure-arm: DNSOverTLS setting: no
    azure-arm: DNSSEC setting: no
    azure-arm: DNSSEC supported: no
    azure-arm: Current DNS Server: 168.63.129.16
    azure-arm: DNS Servers: 168.63.129.16

After :

    azure-arm: Link 2 (eth0)
    azure-arm: Current Scopes: none
    azure-arm: DefaultRoute setting: no
    azure-arm: LLMNR setting: yes
    azure-arm: MulticastDNS setting: no
    azure-arm: DNSOverTLS setting: no
    azure-arm: DNSSEC setting: no
    azure-arm: DNSSEC supported: no

Best regards,

[Sebastien Bacher (seb128)]

Thank you for your bug report. Could you confirm to what version of systemd you are upgrading which is creating the issue?

[Sebastien Bacher (seb128)]

https://bugs.launchpad.net/ubuntu/+source/systemd/245.4-4ubuntu3.3 has some changes are systemd-resolved

[Dan Streetman (ddstreet)]

I'm pretty sure this is a dup of bug 1902960; feel free to un-dup if there is reason to think i'm wrong.