[mythtvnz] Mythbox fails to boot into mythbuntu after powercut

[Paul]

Hi All

I have run into a bit of a problem after a powercut.I was watching a 
recorded program when the power went off.

When it came back on the system booted to a black screen after no more 
than about 2 seconds of activity on the system drive.

I checked the settings for the UEFI boot and all seemed ok.I hit F10 to 
reboot and it came up with the GRUB menu .I did this several 
times,trying various kernels and modes but nothing helped.

I ran Boot Repair and that didn't help either. Here's the boot info file 
URL http://paste.ubuntu.com/25051463/

Boot Repair did direct me to boot the system from 
/EFI/ubuntu/shimx64.efi but I don't know how to select this.

Any help is much appreciated.

I'm currently running on any earlier installation on another drive.

-Paul