dbus_bus_request_name (): Connections are not allowed to own the service

In my case I simply had to restart the dbus service.

This probably was because avahi inserted a dbus config file (/etc/dbus-1/system.d/avahi-dbus.conf) which wasn't detected automatically.

There are restrictions on what client can register what name on the system bus. Otherwise a user process could receive request intended for some system service.The restrictions are configured via the dbus-daemon configuration file, usually /etc/dbus-1/system.conf. In standard installations this file includes other config files, especially all in the /etc/dbus-1/system.d/ directory, where service specific configurations are stored. This way DBus is usually configured for Avahi:

Example from my workstation:

$ cat /etc/dbus-1/system.d/avahi-dbus.conf <!DOCTYPE busconfig PUBLIC          "-//freedesktop//DTD D-BUS Bus Configuration 1.0//EN"          "http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd"><busconfig>  <!-- Only root or user avahi can own the Avahi service -->  <policy user="avahi">    <allow own="org.freedesktop.Avahi"/>  </policy>  <policy user="root">    <allow own="org.freedesktop.Avahi"/>  </policy>  <!-- Allow anyone to invoke methods on Avahi server, except SetHostName -->  <policy context="default">    <allow send_destination="org.freedesktop.Avahi"/>    <allow receive_sender="org.freedesktop.Avahi"/>    <deny send_destination="org.freedesktop.Avahi"          send_interface="org.freedesktop.Avahi.Server" send_member="SetHostName"/>  </policy>  <!-- Allow everything, including access to SetHostName to users of the group "adm" -->  <policy group="adm">    <allow send_destination="org.freedesktop.Avahi"/>    <allow receive_sender="org.freedesktop.Avahi"/>  </policy>  <policy user="root">    <allow send_destination="org.freedesktop.Avahi"/>    <allow receive_sender="org.freedesktop.Avahi"/>  </policy></busconfig>

Make sure you have these standard configuration files or a proper custom configuration in place.

I had a similar problem, in my case the default avahi-dbus.conf that come with my system packet system just lack the last " </policy> " before " </busconfig> " which triggered this error.

I first thought the problem didn't come from this file since a rapid look at it is not enough to find this kind of syntax error.