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i got this error message whenever I tried to call zenity in a cron job of a user. I found some hints in the net but still failed. But's its just 2 commands you have to add.



Add in .bashrc

[[ $DISPLAY ]] && xhost +localhost

Now add following line in the code calling Zenity


  echo "# Backing up user data ..."
  sudo rsnapshot daily
) | DISPLAY=':0.0' zenity --title="Backup running - do not close lid or shut down system" --progress --pulsate --auto-close --width=800 &



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