selenium webdriver - X11: Start desktop manager inside daemon -

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what i'm trying do:
make screenshots of desktop , running program (firefox webdriver selenium, if it's important) in daemon (celeryd) in auto mode.
, need desktop manager running, mandatory requirement. i'm trying use fluxbox can switch other manager.

current progress:
can start x-server (xvfb) in daemon , start selenium webdriver. fluxbox start succeeds when try make terminal, fails in daemon following errors in log:
can't create directory
failed load database:
failed load database:/init
retrying with: /etc/x11/fluxbox/init

i tried specify init-file directly, can't create directory error still exists , fluxbox fails start.
might daemon-mode restriction.

question:
possible run any desktop manager inside daemon?
if yes, how can this?


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