Please move to a more appropriate forum if necessary.

Please see attached screenshots of BIOS startup settings.

I (you don't need to tell me how stupid I was) accidentally deleted /sda1 on an Ubuntu 16.04 machine resulting in damaged EFI Boot settings.

But I was smart, too, as I had a current backup.

Ran boot recover utility - no joy.

Re-installed the Ubuntu operating system but keep getting these horror messages when booting up so I'm pretty sure it's not a OS problem. Most certainly a BIO/EFI issue.

(the screenshot with the dark background pretty much says it all)

I can boot with Ubuntu usb and access drives, etc. but booting from the hard drive just doesn't work.

Tell me what you need to know to help me. Output of commands will be gladly provided.

Thank you.

Attached Thumbnails

         

Did you delete sda1 or the contents of sda1? If you deleted the contents of sda1 then need to reinstall grub using a live cd/usb. If the partition was deleted the will need to recreate the efi partition first then reinstall grub.
download the boot repair iso, boot it, and post the output of the boot-info summary.

Thank you for the quick reply that is very much appreciated.

Here is the pastebin link:

http://paste.ubuntu.com/p/j6GpSCcQ5c/

To answer your question: I deleted the sda1 partition. Completely. Contents included. Then re-installed Ubuntu which created it's new geometry for that entire disk. But as you know, it won't boot.

Seems you have been bitten by the re-installation - see this bugzilla entry. Down the bottom (post #34) for a suggested solution.
Pretty ugly - I'm surprised a fixed iso hasn't been issued.

It looks like the boot files are there on the efi partition. The boot-info script recommends to reinstall grub. Have you tried to go into your bios setup and change the default boot to ubuntu? Run the following from the iso
to change next boot to ubuntu. then reboot and see if ubuntu boots. If so then you can use efibootmanger to make the change permanent. If it doesn't boot then will need to reinstall grub from the iso as suggested at the bottom of the boot-info script

Tried sudo efibootmgr -n 0002 and rebooting. No joy.

I mounted sda1 and see that in EFI there is "Boot" and "ubuntu"

The ubuntu directory has the following files:
fw
fwupx64.efi
grub.cfg
grubx64.efi
mmx64.efi
shimx64.efi

The Boot directory has:

bootx64.efi
bootx64.efi.grb

I looked at the message #34 but honestly couldn't follow the procedure and hesitate to do anything unless I feel confident in knowing what it is doing.

Could I copy the files above from the ubuntu directory in the Boot directory?

Looking for solutions.

I don't know where boot-info script is as you refer to it, colorpurple21859

As well, I don't have options "ubuntu" or "Boot" available in my Bios setup. Just only a reference to the hard drive.

After running boot repair again the final message is:

"Please don't forget to make your BIOS boot on sda1/EFI/ubuntu/shimx64.efi file"

Indeed ubuntu is an option immediately after running boot repair (but only one time is it available.) After rebooting and choosing ubuntu, still same problem, though.

Boot into ubuntu from the iso
open a terminal
check to make sure /dev/sda1 in mounted on /boot/efi
reinstall grub

SOLVED:

Followed the tip for copying /EFI/BOOT/grubx64.efi with the name mmx64.efi to both subdirectories "Boot" and "ubuntu".

On next boot I first went into bios and the only option now available was the hard drive.

Chose it.

Rebooted into Ubuntu.

Rebooted again just to make sure. Still boots fine.

If anyone sees any harm in this option of copying that file over to two (2) subdirectories let me know (/EFI/BOOt and EFI/ubuntu)

NO problems here if it works, some efi-bios will only allow booting from /efi/boot/
at least you got it figured out

Great! Thanks for pointing me in the right direction, all.

Very much appreciated. I can access my 'puter now and do work.

All have a great Holiday!