[Bug 1874021] Re: avahi-browse -av is empty, mdns not working in arduino ide

[Jeroenst]

Here is the avahi log you requested.

I also want to make my complements to the excellent support you're
supplying to me.

** Attachment added: "journalctl_avahi.txt"
   https://bugs.launchpad.net/ubuntu/+source/avahi/+bug/1874021/+attachment/5358302/+files/journalctl_avahi.txt

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https://bugs.launchpad.net/bugs/1874021

Title:
  avahi-browse -av is empty, mdns not working in arduino ide

Status in avahi package in Ubuntu:
  Incomplete

Bug description:
  When I started the arduino IDE my port list is empty. This list relies
  on multicast DNS which is served by avahi.

  When running the avahi-browse -av command on ubuntu 18.04 I get a list
  of al mdns devices. On ubuntu 20.04 the're no mdns devices reported.

  The avahi-daemon is running. And when executing netstat -nlp | grep
  5353 I see avahi-daemon is listening. When also running tcpdump port
  5353 I see mdns packages arriving. But still avahi-browse -av is
  empty.

  iptables -A shows no rules and policies are accept
  ufw is disabled

  I also removed apparmor but also that didn't make any difference.

  On both ubuntu 18.04 and 20.04 the avahi version is 0.7.
  ---
  ProblemType: Bug
  ApportVersion: 2.20.11-0ubuntu27
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  DistroRelease: Ubuntu 20.04
  InstallationDate: Installed on 2020-04-08 (13 days ago)
  InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Beta amd64 (20200402)
  Package: avahi-daemon 0.7-4ubuntu7
  PackageArchitecture: amd64
  ProcVersionSignature: Ubuntu 5.4.0-25.29-generic 5.4.30
  Tags:  focal
  Uname: Linux 5.4.0-25-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dialout dip lpadmin lxd plugdev sambashare sudo
  _MarkForUpload: True

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