simple-scan is trying to start disabled avahi-daemon.service

[Antonin Vecera]

Hi,

I have a fresh installation of Ubuntu desktop 21.04.
I stop and disable avahi-daemon.service + avahi-daemon.socket
(I don't use these services on my desktop)
Then I start "simple-scan" program.

After that I see a pop-up window for admin password!
It's wrong, no such thing should be there.

In previouse release (20.10) it was OK.

Thanks.
Antonin

ProblemType: Bug
DistroRelease: Ubuntu 21.04
Package: policykit-1 0.105-30
ProcVersionSignature: Ubuntu 5.11.0-16.17-generic 5.11.12
Uname: Linux 5.11.0-16-generic x86_64
ApportVersion: 2.20.11-0ubuntu65
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Sat Apr 24 15:17:52 2021
InstallationDate: Installed on 2021-04-22 (1 days ago)
InstallationMedia: Ubuntu 21.04 "Hirsute Hippo" - Release amd64 (20210420)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=cs_CZ.UTF-8
 SHELL=/bin/bash
SourcePackage: policykit-1
UpgradeStatus: No upgrade log present (probably fresh install)

[Antonin Vecera (antonin.vecera)]

To be clear...
I want to start an application to scan some document.
I am unexpectedly asked for admin password.
If I enter right password, avahi-daemon.service is started.

I guess it should not disturb with password dialog and not try to start disabled service.

I am not sure which component does it - systemd, dbus, policykit?

[Alex Hofmann (ubuntu-postkasten)]

The report is now 2 years old, so I'm not sore if anyone will still read or follow this, but I don't think it's related to policykit, not even related to simple-scan.

I got the same message recently, and it's probably related to the hpaio backend of sane (included in hplib).

There's a bugreport on this here: https://bugs.launchpad.net/hplip/+bug/1996438

As a workaround, when no HP scanner is used, you can disable this e.g. by editing `/etc/sane.d/dll.d/hplib` and commenting out the only included library there:

====
# dll.conf snippet for hplip
#

#hpaio
====

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.