You have been subscribed to a public bug by Ove Risberg (ove-risberg):
When trying to launch gnome-flashback (metacity) session from
XRDP/VNC/NX/X2GO/Chromoting it fails with diagnostics in log:
>gnome-session-is-accelerated: No composite extension.
>gnome-session-check-accelerated: Helper exited with code 256
>gnome-session-is-accelerated: No composite extension.
>gnome-session-check-accelerated: Helper exited with code 256
>** (process:11622): WARNING **: software acceleration check failed: Child
>process exited with code 1
When starting manually gnome-panel, metacity, nautilus and other
components from .xsession - it works normally.
Looks like - unnecessary check performed (and failed).
This breaks gnome-flashback, breaking upgrade path from previous LTS and
removing most sane option for cloud environments!
** Affects: gnome-session (Ubuntu)
Importance: Undecided
Status: In Progress
** Tags: regression-release trusty
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gnome-flashback (metacity) fails to start without hardware acceleration,
cloud/remote environments (Forwarded-X/XRDP/VNC/NX/X2GO/Chromoting)
https://bugs.launchpad.net/bugs/1251281
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