GRUB2 menu under Ubuntu

[edwardp-mh2Nk+tgbQM at public.gmane.org (edwardp-mh2Nk+tgbQM at public.gmane.org)]

Due to a video issue on a laptop, I had to reinstall Xubuntu (Ubuntu 
with XFCE desktop), because as root (sudo), it would not let me delete 
the directory which had the personalizations (directory not empty).  
Deleting that directory likely would have fixed the problem.

Because this is the only OS installed on the laptop, the GRUB2 menu does 
not appear when the laptop is powered on, I believe the default number 
of seconds was set to zero.  On other systems where it is dual-boot with 
Windows, the menu appears for 10 seconds before booting into Xubuntu by 
default.

Does GRUB2 have a file that can be edited to force the menu to appear 
for the same 10 seconds on the laptop?  Since the menu did not appear, 
the laptop could not be booted into recovery mode, which might have also 
fixed the video issue (reconfigured X).  (FWIW, the video is detected as 
an ATi Radeon chip and I'm sure there have been known issues with ATi 
and Linux.)

Thank you for any info.