[Bug 1869393] [NEW] avahi-browse -kprtf _apt_proxy._tcp does not show any output, but the server is actually alive

[Norbert]

Public bug reported:

Steps to reproduce:
1. Have Ubuntu 20.04 LTS installed
2. Have `squid-deb-proxy` on the same local network
3. Install `squid-deb-proxy-client` package on 20.04 LTS
4. Monitor logs of `squid-deb-proxy` server with tail
5. Run any `apt-get` `install`/`download`/`upgrade`/`update` on 20.04 LTS client system with

Expected results:
* 20.04 LTS client system uses `squid-deb-proxy` server via `squid-deb-proxy-client` package

Actual results:
* the avahi-browse does not work, so packages are downloaded directly from Ubuntu mirrors instead of `squid-deb-proxy`

Debug:

* the command `avahi-browse -kprtf _apt_proxy._tcp` which is called by
`/usr/share/squid-deb-proxy-client/apt-avahi-discover` does not return
any output on 20.04 LTS client. Other clients - 16.04 LTS and 19.10 have
normal command output for this command.


Notes:

* avahi-discover GUI window is empty too.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: avahi-utils 0.7-4ubuntu6
ProcVersionSignature: Ubuntu 5.4.0-18.22-generic 5.4.24
Uname: Linux 5.4.0-18-generic x86_64
ApportVersion: 2.20.11-0ubuntu21
Architecture: amd64
CurrentDesktop: MATE
Date: Fri Mar 27 19:25:45 2020
InstallationDate: Installed on 2020-03-25 (2 days ago)
InstallationMedia: Ubuntu-MATE 20.04 LTS "Focal Fossa" - Alpha amd64 (20200325)
SourcePackage: avahi
UpgradeStatus: No upgrade log present (probably fresh install)

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


** Tags: amd64 apport-bug focal

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https://bugs.launchpad.net/bugs/1869393

Title:
  avahi-browse -kprtf _apt_proxy._tcp does not show any output, but the
  server is actually alive

Status in avahi package in Ubuntu:
  New

Bug description:
  Steps to reproduce:
  1. Have Ubuntu 20.04 LTS installed
  2. Have `squid-deb-proxy` on the same local network
  3. Install `squid-deb-proxy-client` package on 20.04 LTS
  4. Monitor logs of `squid-deb-proxy` server with tail
  5. Run any `apt-get` `install`/`download`/`upgrade`/`update` on 20.04 LTS client system with

  Expected results:
  * 20.04 LTS client system uses `squid-deb-proxy` server via `squid-deb-proxy-client` package

  Actual results:
  * the avahi-browse does not work, so packages are downloaded directly from Ubuntu mirrors instead of `squid-deb-proxy`

  Debug:

  * the command `avahi-browse -kprtf _apt_proxy._tcp` which is called by
  `/usr/share/squid-deb-proxy-client/apt-avahi-discover` does not return
  any output on 20.04 LTS client. Other clients - 16.04 LTS and 19.10
  have normal command output for this command.

  
  Notes:

  * avahi-discover GUI window is empty too.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: avahi-utils 0.7-4ubuntu6
  ProcVersionSignature: Ubuntu 5.4.0-18.22-generic 5.4.24
  Uname: Linux 5.4.0-18-generic x86_64
  ApportVersion: 2.20.11-0ubuntu21
  Architecture: amd64
  CurrentDesktop: MATE
  Date: Fri Mar 27 19:25:45 2020
  InstallationDate: Installed on 2020-03-25 (2 days ago)
  InstallationMedia: Ubuntu-MATE 20.04 LTS "Focal Fossa" - Alpha amd64 (20200325)
  SourcePackage: avahi
  UpgradeStatus: No upgrade log present (probably fresh install)

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