Firefox doesn't start because Cron doesn't set the 'DISPLAY' environment
variable which Firefox requires (try 'DISPLAY= firefox' in terminal).
This can be worked around by setting the DISPLAY variable in the crontab
('5 * * * * DISPLAY=:0 /usr/bin/firefox')
See https://help.ubuntu.com/community/CronHowto#GUI_Applications for
details.
** Changed in: ubuntu
Status: New => Invalid
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https://bugs.launchpad.net/bugs/993723
Title:
cron jobs never execute
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