概要

Rhtymbox（OS標準のアプリ）を起動するたびにログイン画面に戻ってしまい、困っています。
ジャーナルの中にat-spi2-registr[5483]: AT-SPI: Cannot open default displayとあるのですが、これが原因なのでしょうか。

正常に起動できる方法が一番の望みですが、
原因を調べるにあたって他に収集するものとか手がかりがあればお教えください。

以上、ご教授のほどよろしくお願いします。

環境

OS:Ubuntu 18.04.2 LTS

$ uname -a
Linux hallucigenia-Base 4.15.0-50-generic #54-Ubuntu SMP Mon May 6 18:46:08 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
$ lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 18.04.2 LTS
Release:	18.04
Codename:	bionic

rhytmbox
バージョン：3.4.2-4ubuntu1
ソース：ubuntu-bionic-main

ジャーナル

$ journalctl
:
 5月 24 22:20:38 PC-Base gsd-power[5392]: AT-SPI: Could not obtain desktop path or name
 5月 24 22:20:38 PC-Base gsd-keyboard[5442]: AT-SPI: Could not obtain desktop path or name
 5月 24 22:20:38 PC-Base gsd-clipboard[5431]: AT-SPI: Could not obtain desktop path or name
 5月 24 22:20:38 PC-Base gnome-terminal-[5640]: AT-SPI: Could not obtain desktop path or name
 5月 24 22:20:38 PC-Base nautilus-deskto[5515]: AT-SPI: Could not obtain desktop path or name
 5月 24 22:20:38 PC-Base gsd-color[5429]: AT-SPI: Could not obtain desktop path or name
 5月 24 22:20:38 PC-Base gsd-media-keys[5440]: AT-SPI: Could not obtain desktop path or name
 5月 24 22:20:38 PC-Base nautilus[5556]: AT-SPI: Could not obtain desktop path or name
 5月 24 22:20:29 PC-Base at-spi2-registr[5418]: AT-SPI: Cannot open default display
 5月 24 22:20:29 PC-Base at-spi-bus-launcher[1609]: Invalid MIT-MAGIC-COOKIE-1 keydbus-daemon[1631]: Activating service name='org.a11y.atspi.Registry' requested by ':1
 5月 24 22:20:29 PC-Base spice-vdagent[5421]: Cannot access vdagent virtio channel /dev/virtio-ports/com.redhat.spice.0
 5月 24 22:20:29 PC-Base at-spi2-registr[5424]: Could not open X display
 5月 24 22:20:29 PC-Base at-spi-bus-launcher[1609]: Invalid MIT-MAGIC-COOKIE-1 keydbus-daemon[1631]: Successfully activated service 'org.a11y.atspi.Registry'
 5月 24 22:20:29 PC-Base at-spi-bus-launcher[1609]: SpiRegistry daemon is running with well-known name - org.a11y.atspi.Registry
 5月 24 22:20:29 PC-Base at-spi2-registr[5424]: AT-SPI: Cannot open default display
 5月 24 22:20:29 PC-Base at-spi-bus-launcher[1609]: Invalid MIT-MAGIC-COOKIE-1 keydbus-daemon[1631]: Activating service name='org.a11y.atspi.Registry' requested by ':1
 5月 24 22:20:29 PC-Base at-spi2-registr[5439]: Could not open X display
 5月 24 22:20:29 PC-Base at-spi-bus-launcher[1609]: Invalid MIT-MAGIC-COOKIE-1 keydbus-daemon[1631]: Successfully activated service 'org.a11y.atspi.Registry'
 5月 24 22:20:29 PC-Base at-spi-bus-launcher[1609]: SpiRegistry daemon is running with well-known name - org.a11y.atspi.Registry
 5月 24 22:20:29 PC-Base at-spi2-registr[5439]: AT-SPI: Cannot open default display
 5月 24 22:20:29 PC-Base at-spi-bus-launcher[1609]: Invalid MIT-MAGIC-COOKIE-1 keydbus-daemon[1631]: Activating service name='org.a11y.atspi.Registry' requested by ':1
 5月 24 22:20:29 PC-Base at-spi2-registr[5451]: Could not open X display
 5月 24 22:20:29 PC-Base at-spi-bus-launcher[1609]: Invalid MIT-MAGIC-COOKIE-1 keydbus-daemon[1631]: Successfully activated service 'org.a11y.atspi.Registry'
 5月 24 22:20:29 PC-Base at-spi-bus-launcher[1609]: SpiRegistry daemon is running with well-known name - org.a11y.atspi.Registry
 5月 24 22:20:29 PC-Base at-spi2-registr[5451]: AT-SPI: Cannot open default display
 5月 24 22:20:29 PC-Base gnome-session[5219]: gnome-session-binary[5219]: WARNING: App 'spice-vdagent.desktop' exited with code 1
 5月 24 22:20:29 PC-Base gnome-session-binary[5219]: WARNING: App 'spice-vdagent.desktop' exited with code 1
 5月 24 22:20:29 PC-Base gsd-clipboard[5431]: AT-SPI: Could not obtain desktop path or name
 5月 24 22:20:29 PC-Base at-spi-bus-launcher[1609]: Invalid MIT-MAGIC-COOKIE-1 keydbus-daemon[1631]: Activating service name='org.a11y.atspi.Registry' requested by ':1
 5月 24 22:20:29 PC-Base gsd-wacom[5413]: AT-SPI: Could not obtain desktop path or name
 5月 24 22:20:29 PC-Base dbus-daemon[882]: [system] Activating via systemd: service name='org.freedesktop.hostname1' unit='dbus-org.freedesktop.hostname1.service' requ
 5月 24 22:20:29 PC-Base systemd[1]: Starting Hostname Service...
 5月 24 22:20:29 PC-Base at-spi2-registr[5470]: Could not open X display
 5月 24 22:20:29 PC-Base gsd-xsettings[5408]: Failed to get current display configuration state: GDBus.Error:org.freedesktop.DBus.Error.NameHasNoOwner: Name "org.gnome
 5月 24 22:20:29 PC-Base at-spi-bus-launcher[1609]: Invalid MIT-MAGIC-COOKIE-1 keydbus-daemon[1631]: Successfully activated service 'org.a11y.atspi.Registry'
 5月 24 22:20:29 PC-Base at-spi-bus-launcher[1609]: SpiRegistry daemon is running with well-known name - org.a11y.atspi.Registry
 5月 24 22:20:29 PC-Base at-spi2-registr[5470]: AT-SPI: Cannot open default display
 5月 24 22:20:29 PC-Base gsd-clipboard[5431]: AT-SPI: Could not obtain desktop path or name
 5月 24 22:20:29 PC-Base at-spi-bus-launcher[1609]: Invalid MIT-MAGIC-COOKIE-1 keydbus-daemon[1631]: Activating service name='org.a11y.atspi.Registry' requested by ':1
 5月 24 22:20:29 PC-Base gsd-clipboard[5431]: atk-bridge: get_device_events_reply: unknown signature
 5月 24 22:20:29 PC-Base gsd-clipboard[5431]: atk-bridge: get_device_events_reply: unknown signature
 5月 24 22:20:29 PC-Base gsd-clipboard[5431]: atk-bridge: GetRegisteredEvents returned message with unknown signature
 5月 24 22:20:29 PC-Base at-spi2-registr[5483]: Could not open X display
 5月 24 22:20:29 PC-Base gsd-power[5392]: AT-SPI: Could not obtain desktop path or name
 5月 24 22:20:29 PC-Base at-spi-bus-launcher[1609]: Invalid MIT-MAGIC-COOKIE-1 keydbus-daemon[1631]: Successfully activated service 'org.a11y.atspi.Registry'
 5月 24 22:20:29 PC-Base at-spi-bus-launcher[1609]: SpiRegistry daemon is running with well-known name - org.a11y.atspi.Registry
 5月 24 22:20:29 PC-Base at-spi2-registr[5483]: AT-SPI: Cannot open default display
 5月 24 22:20:29 PC-Base gsd-power[5392]: AT-SPI: Could not obtain desktop path or name
: