[Bug 1982553] Re: Search domains not working after upgrading to Ubuntu 22.04

[Jon Schewe]

I'm seeing a similar issue as well. Hostnames on my local network no
longer resolve after upgrading to Ubuntu 22.04.1

>cat 01-network-manager-all.yaml 
# Let NetworkManager manage all devices on this system
network:
  version: 2
  renderer: NetworkManager


jpschewe at jon-2019:/etc/netplan
>cat 01-network-manager-all.yaml 
# Let NetworkManager manage all devices on this system
network:
  version: 2
  renderer: NetworkManager

/etc/netplan
jpschewe at jon-2019:/etc/netplan
>resolvectl 
Global
       Protocols: -LLMNR -mDNS -DNSOverTLS DNSSEC=no/unsupported
resolv.conf mode: foreign

Link 2 (enp8s0f1)
Current Scopes: none
     Protocols: -DefaultRoute +LLMNR -mDNS -DNSOverTLS DNSSEC=no/unsupported

Link 3 (wlp0s20f3)
    Current Scopes: DNS
         Protocols: +DefaultRoute +LLMNR -mDNS -DNSOverTLS DNSSEC=no/unsupported
Current DNS Server: 192.168.46.1
       DNS Servers: 192.168.46.1
        DNS Domain: mn.mtu.net

Link 4 (vboxnet0)
Current Scopes: none
     Protocols: -DefaultRoute +LLMNR -mDNS -DNSOverTLS DNSSEC=no/unsupported


jpschewe at jon-2019:/etc/netplan
>ping eggplant-2013
ping: eggplant-2013: Name or service not known

/etc/netplan
jpschewe at jon-2019:/etc/netplan
>ping eggplant-2013.mn.mtu.net
PING eggplant-2013.mn.mtu.net (192.168.42.129) 56(84) bytes of data.

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https://bugs.launchpad.net/bugs/1982553

Title:
  Search domains not working after upgrading to Ubuntu 22.04

Status in netplan.io package in Ubuntu:
  Incomplete
Status in systemd package in Ubuntu:
  Confirmed

Bug description:
  Hello,

  After upgrading to Ubuntu 22.04, I noticed that search domains are not
  working anymore.

  Either I configure search domains via netplan or with graphical "nm-
  connection-editor", this is not taken into account when resolving
  domain names.

  For instance if I configure "domain.com" in search domains list,
  looking for "host" does not look for "host.domain.com". This is
  confirmed with a wireshark capture. Consequently if I want to connect
  with SSH to host.domain.com, I have to type the entire url.

  In Ubuntu 20.04 this works correctly. With a packet capture I can see
  one domain lookup for each of my search domains configured.

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