Comment 9 for bug 1658996

I think this could shade some more light onto it:
[Debug] Running in debugging mode.
[Welcome] Using /usr/share/ubuntu-mate-welcome/ path.
[i18n] Locale Not Available: null (using en_US instead)
[i18n] Locale Not Available: null (using en_US instead)
[i18n] All translated i18n pages found.
[i18n] Using locale for gettext: null
[i18n] Using path for gettext: /usr/share/ubuntu-mate-welcome/locale/
[i18n] Translation found for gettext.
[Queue] Preferences loaded from file.
[Specs] Detecting graphics vendor...
[Network Test] Establishing a connection test to "http://archive.ubuntu.com/"
[Welcome] Font DPI is: 0
[Welcome] DPI below 50. Out of range..
[Specs] Detected: InnoTek Systemberatung GmbH VirtualBox Graphics Adapter
[Welcome] Setting zoom level to: 1.0
[Welcome] Successfully pinged: http://archive.ubuntu.com/
[Apps] Reading index...
[Apps] Successfully loaded index.
[Config] Read "hide_non_free" => "False"
[Welcome] Version: 17.04.10
[Pre-Install] System is running Ubuntu 17.04 (zesty)
[Welcome] Application Ready.

(gst-plugin-scanner:9298): GStreamer-WARNING **: Failed to load plugin '/usr/lib/x86_64-linux-gnu/gstreamer-1.0/libgstmirsink.so': /usr/lib/x86_64-linux-gnu/gstreamer-1.0/libgstmirsink.so: undefined symbol: glFramebufferTexture2D
[Welcome] Page: splash.html
      file:///usr/share/ubuntu-mate-welcome/splash.html
utz@URMate64:~$ [Welcome] Page: index.html
      file:///usr/share/ubuntu-mate-welcome/index.html