I guess this is one of those "Nope, no-one knows" issues.
In the end I just used efibootmgr to delete the Ubuntu option and went back
to booting Windows 10 all the time on that laptop.
Maybe I'll have another shot another time when I can be bothered. At least
my Acer C720 is pure-Linux so I have that still.. pity suspend and resume
doesn't work properly on it though :(
On Thu, 29 Oct 2015 at 14:28 Toby Corkindale <toby(a)dryft.net> wrote:
After re-installing Kubuntu on my (EFI, GPT) laptop (which also has
Windows 10), I've ended up with a broken grub. It used to work fine.
The problem is that now it boots into grub, with no configuration, just
the grub> prompt.
I can continue by typing:
grub> configfile (hd0,gpt6)/boot/grub/grub.cfg
which then brings up the usual menu.
But I'd like to know how to configure grub so that it finds it
Needless to say, I have already tried running grub-install /dev/sda after
(Which succeeds without error)
PS. I don't want to totally blank the drive, as it shares with a Windows
10 install that I'd like to keep.