Why, all of a sudden, out of nowhere, am I getting the following Grub screen at boot of my dual boot, Windows 10 pro & Linux Mint 17.3 Cinnamon.
My boot manager is EasyBcd.

"GNU GRUB 2.02~beta-9ubuntu1.7
Minimal BASH-like line editing is supported. For the first word, TAB lists possible command completions.
Anywhere else TAB lists possible device or file completions.
grub>_"

I have tried a re-install of Windows 10 from a recent Acronis True Image backup which included the EFI partition at the start of my HDD which is my active boot partition. I've tried grub repair. I've tried removing the grub loader from EasyBcd & I've booted to a Windows 10 installer USB and ran "bootrec /FixBoot", "bootrec /FixMbr, "bootrec /RebuildBcd" and tried Startup Repair. All to no avail.
If I type "exit" and then Enter at this superfluous grub boot screen (which I can't get rid of) it will then take me to my correct EasyBcd boot menu.
I need a solution and all/any help with this annoying issue would be much appreciated.
Thanks in advance.
Jim.

Probably got a grub update - which could of course happen again in the future.
I haven't used EasyBCD in years, but you should be able to use efibootmgr (from Linux) to make the Win10 entry the default boot.

Grub is 'superfluous' only if you don't have Mint any longer. EasyBCD simply chainloads to the Grub on the Mint partition making it necessary. See the EasyBCD link below. So if when you select Mint from the windows (EasyBCD) boot menu and then get that message, something has changed in the boot files or kernels. It isn't actually clear if that's the case. Do you see this only when you select Mint or when you select windows also? If you haven't resolved this, it might help if you ran the boot repair software from the site below using your Mint Live DVD/flash drive. Select the option to Create BootInfo Summary and post a link here.

https://neosmart.net/wiki/easybcd/dual-boot/linux/

https://help.ubuntu.com/community/Boot-Repair

Can't find any such animal as "efibootmgr" :-(

Than you for the response yancek.
The odd (out of nowhere) grub menu is the first thing to appear on a cold bird and/or restart and if I then type exit at the grub>_ prompt then tap the enter key I get to my normal boot menu for Windows 10 or Mint and can then boot into either of them. I have already run the boot repair software and every other fix I can think of. If only I could find out where/what location on my machine this odd grub menu is springing from then I might be able to kill it.
Regards, Jim.

If you've already run boot repair, why not post a link to the output here so that someone else who has a little more knowledge can take a look at it.

Thank you, shall do.

You can find the results of my boot repair at http://paste2.org/2DwH6ObI and following this boot repair I am still getting the unwanted grub screen at start up and reboot.
Thank you for your kind attention
Jim

So install it - it must be in the Ubuntu/Mint repos (it's from Intel).

You have windows code in the MBR of both sda and sdb. sda, the windows only drive appears to be an MBR install with standard (non-gpt) partitioning. sdb5, your Ubuntu partition doesn't show the files normally shown but that may not be significant. EasyBCD chainloads to the Ubuntu Grub and the boot repair output does not show any grub.cfg file except on the flash drive. It does show other grub files on sdb5. You have an efi partition on sdb4 but boot repair doesn't show any of the windows/Mint files. I'm not familiar enough with UEFI to make any detailed suggestions. Good luck with it.