Sometimes, when I reboot the dirty way, I get a menu (black screen, grey letters) .

This is asking to choose what/how I want to launch Ubuntu (very sorry I dont remind which modes).

How is it possible to disable it ? cause the computer has no screen and I dont want boot to be stopped by this screen.

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    Simple solution: Do not hard reboot. Advanced solution: see linked question above. – Byte Commander Sep 14 '15 at 9:59
  • @ByteCommander : thank you but... without screen, users do hard reboot to shut down. Unless a better way is possible (w/o screen) ? – 3pic Sep 14 '15 at 10:02
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    You have a keyboard? I guess without monitor it's a server release without GUI. Can't you configure it to shutdown if you only touch the power button (ACPI settings or something like that) instead of hard-shutdown? Or you could at least use the magic kernel commands (ALT+SYSRQ+R, then +E, +I, +S, +U and +B, waiting a short time for each command to complete.) – Byte Commander Sep 14 '15 at 10:09
  • Another possibility is to remote login (I use PuTTY for that) and to start the command reboot – Marc Vanhoomissen Sep 14 '15 at 10:37

You need to change the grub boot settings..

sudo -H gedit /etc/default/grub

you need to change this line:




save configuration file and update grub:

sudo update-grub

There are also some grub setting applications that can help you with this using a gui.

  • @Mackel, thank you. Im about to test it... one stupid question though ? what is the best way to reproduce Grub menu display ? – 3pic Sep 14 '15 at 12:01
  • may be changing that back to true ? – erluxman May 31 '17 at 11:52

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