On 05/10/13 09:00, Francesco Pietra wrote:
I forgot asking naively how to boot safely to the grub menu.

When the system starts booting, the grub menu entries appear on screen. After a timeout (default 5 sec) the default entry is selected and the boot sequence continues. For details, here is the grub manual: <http://www.gnu.org/software/grub/manual/grub.html>.

Extract from the manual:
Valid keys in /etc/default/grub are as follows:

‘GRUB_DEFAULT’
    The default menu entry. This may be a number, in which case it identifies 
the Nth entry in the generated menu counted from zero, or the title of a menu 
entry, or the special string ‘saved’. Using the title may be useful if you want 
to set a menu entry as the default even though there may be a variable number 
of entries before it.

‘GRUB_TIMEOUT’
    Boot the default entry this many seconds after the menu is displayed, 
unless a key is pressed. The default is ‘5’. Set to ‘0’ to boot immediately 
without displaying the menu, or to ‘-1’ to wait indefinitely.

--
Klaus


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