I am affected by this issue on Ubuntu 15.04 x86_64. I have AMI BIOS/UEFI. Ctrl-X does not work (but F10 works). In my case 'x' is inserted as if I did not press Ctrl key.
I found a discussion and a potential patch at: https://lists.gnu.org/archive/html/grub-devel/2013-08/msg00003.html
Possibly related question at StackExchange: https://unix.stackexchange.com/questions/103989/pressing-ctrl-x-or-f10-does-not-boot-linux
I am affected by this issue on Ubuntu 15.04 x86_64. I have AMI BIOS/UEFI. Ctrl-X does not work (but F10 works). In my case 'x' is inserted as if I did not press Ctrl key.
I found a discussion and a potential patch at: https:/ /lists. gnu.org/ archive/ html/grub- devel/2013- 08/msg00003. html
Possibly related question at StackExchange: https:/ /unix.stackexch ange.com/ questions/ 103989/ pressing- ctrl-x- or-f10- does-not- boot-linux