I've used the same instructions before and they worked fine, but it must have been for a machine without UEFI. The main reason for suggesting this was just a quick check to make sure that boot-repair had done it's job correctly and then we could look at other reasons for why you were getting the black screen.
Why it's throwing up errors for you, I unfortunately don't know. (incidentally, the 'grub-probe: error ' is for sdb1 which is the Live USB so can be ignored) In this case, the Ubuntu installation was on sda7 (for you it was sda5) and the EFI partition was on sda2 (for you it was sda1). Here's my Live USB grub fixing that did work: Adding one extra line lets it work, but it took a lot of chasing down other possibilities before realising this.Īs an extra bonus, it also didn't actually work for you even with the line added :(
The nicely laid out instructions from 'How to Ubuntu' on how to repair Grub with a live USB ( ) are unfortunately incorrect if using an EFI system. This is not the answer, but it lets me show you a picture of what should work when booting from a Live USB and reinstalling Grub.
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