Public bug reported:

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:
    azure-arm:        LLMNR setting: yes
    azure-arm: MulticastDNS setting: no
==> azure-arm: WARNING: apt does not have a stable CLI interface. Use with 
caution in scripts.
    azure-arm:   DNSOverTLS setting: no
==> azure-arm:
    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,

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: focal systemd systemd-resolved

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https://bugs.launchpad.net/bugs/1903036

Title:
  systemd-* no more resolution after apt upgrade 20.04

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