Edited grub - cant boot LL

[gold_finger]

Thank you for that clarification. Most new users (windows converts, especially dual booters) need to know these things. Modifications are wonderful, and your solution works here, but not without possible complications down the road. It is worth noting that it's possible that shift key binding in this way could effect the use of Windows rescue media depending on the boot device ordering. Probably best to keep cd/dvd as the first boot device if possible. Shift is often linked to function keys on laptops, so again for pre-boot situations like widows rescue media, or live CD's the effect could be critical, if grub is in control when Windows opts to default to the media channel for rescue media. Some boxes with faulty OEM firmware actually run Windows on the media channel by default, locking device boot order to HDD first, and in such cases especially with laptop keyboards rescue media might not work at all if grub is in control with shift key binding when Windows boot fails, probably simply bringing up the grub menu again. Some laptops do not offer a pause key for boot device selection, some not even the option to order boot devices. Finally if the shift key is bound in grub, I wonder if edit character functions in the grub menu screen itself would work properly, or would it keep reproducing a new grub menu screen every time you shifted for character selection?         

TC

Understand your concern, however none of that should be a problem.  When computer first boots, Bios firmware is in control and when ready looks to first sector of hard drive (where 1st stage of grub boot loader is) for boot code to finish boot process into an operating system.  Grub doesn't change anything in Bios and any key invocations set there will remain in effect.

Grub also has nothing to do with boot order set in Bios, so boot order can be set (or changed) to anything one wants and grub won't interfere or affect that in any way.

Finally if the shift key is bound in grub, I wonder if edit character functions in the grub menu screen itself would work properly, or would it keep reproducing a new grub menu screen every time you shifted for character selection?         

TC

No, that shouldn't happen.  It's only looking for a <SHIFT> press during those initial first few seconds after Bios check has completed and grub boot process is initiated.  Once past that point the various grub scripts have already run and are done with -- they won't come into play anymore.