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I recently installed Xubuntu 14.04 on a Dell Workstation. Whenever I shutdown, two things happen. Either it shuts down and automatically restarts, or it hangs at shutdown with a black screen.

Searching for a solution I have tried the following: used sudo shutdown -h now, sudo shutdown -P now, sudo init 0 from terminal

amended and updated /etc/default/grub to GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi=force"

checked the BIOS for Wake on LAN (not an option for the DELL Precicion 7400 Workstation)

reinstalled Xubuntu

None of these have solved the problems so far.

Anyone have any other options for me to try?

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Did you read this older entry askubuntu.com/questions/26601/… or this askubuntu.com/questions/349236/… –  TuKsn May 8 '14 at 13:36
Same problem here. Actually in my case was a result of some update I guess as it was working fine just few days ago. My laptop screen turns off after some minutes despite my settings. –  lepe Sep 27 '14 at 13:41

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