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I've used reboot for quite a few years to reboot Ubuntu Server, but now the command just puts Ubuntu into some low level, unresponsive state and I have to use the reset button to reboot. I don't have a monitor connected to the server. How can I troubleshoot this?

It began after the last HWE update, where at first it was spurious, but now it's every time I try to reboot.

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On my old Dell I had to use

reboot=acpi 

kernel paramenter, hinted from here. Maybe you need a couple of experiments --- my old Dell did not restart every other reboot (!) without the kernel parameter. BIOS mysteries...

  • The problem is that it used to reboot every single time. I've been using this motherboard for over four years. – Paul Oct 9 '14 at 17:10
  • Could be a regression introduced by the new kernel in the HWE update... – Rmano Oct 9 '14 at 17:11
  • What do you mean? The current Ubuntu was installed in May/June with the 12.04 ISO. – Paul Oct 9 '14 at 17:13
  • The HWE update will normally install a newer kernel --- it will enable newer drivers and so on, but it can (although it's quite rare) introduce bugs and regressions. – Rmano Oct 9 '14 at 17:17

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