Bluetooth

> Теперь не понятно: откуда взялось требование файла "main.conf"?

это нормально
не в этом суть.

вот причина, имхо hcid[14748]: Unable to get on D-Bus
/etc/dbus-1/system.d/bluetooth.conf у вас есть?
для bluez-3.xx он выглядит так (пример я взял с коммуникатора, но не суть важно):

<!-- This configuration file specifies the required security policies
     for Bluetooth core service to work. -->

<!DOCTYPE busconfig PUBLIC "-//freedesktop//DTD D-BUS Bus Configuration 1.0//EN"
 "http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd">
<busconfig>

  <!-- ../system.conf have denied everything, so we just punch some holes -->

  <policy user="root">
    <allow own="org.bluez"/>
  </policy>

  <policy at_console="true">
    <allow send_destination="org.bluez.Manager"/>
    <allow receive_sender="org.bluez.Manager"/>

    <allow send_path="/org/bluez"/>

    <allow send_destination="org.bluez.Adapter"/>
    <allow receive_sender="org.bluez.Adapter"/>

    <allow send_destination="org.bluez.Service"/>
    <allow receive_sender="org.bluez.Service"/>

    <allow send_destination="org.bluez.Database"/>
    <allow receive_sender="org.bluez.Database"/>

    <allow send_destination="org.bluez.Security"/>
    <allow receive_sender="org.bluez.Security"/>
  </policy>

</busconfig>

а вот для bluez-4 так (это уже с генты):

<!-- This configuration file specifies the required security policies
     for Bluetooth core daemon to work. -->

<!DOCTYPE busconfig PUBLIC "-//freedesktop//DTD D-BUS Bus Configuration 1.0//EN"
 "http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd">
<busconfig>

  <!-- ../system.conf have denied everything, so we just punch some holes -->

  <policy user="root">
    <allow own="org.bluez"/>
    <allow send_destination="org.bluez"/>
    <allow send_interface="org.bluez.Agent"/>
  </policy>

  <policy at_console="true">
    <allow send_destination="org.bluez"/>
  </policy>

  <policy context="default">
    <deny send_destination="org.bluez"/>
  </policy>

</busconfig>

поройте в этом направлении