Comment 9 for bug 1633839

I have tried 'boot-repair' in normal and advanced mode and have tried reinstalling grub via sudo grub-install /dev/sda1 (then sda2, and finally simply sda). All of these approaches have reported 'success' in bash/terminal etc - but none have actually solved my problem.
Actually I'm wondering where my 'working' grub is actually installed. I have a UEFI machine which originally came with Windows 8. On installing Ubuntu I did what was necessary to allow Ubuntu 14.04 to be installed successfully instead of Windows, and have 3 partitions: sda1 is allegedly my boot partition (Fat 32), sda2 my main partition and finally there is a sda3 - for Linux-Swap. I suppose it is possible I have two grubs installed, one in sda1 and the other in sda2. Is it possible that a delay in reaching the 'working' grub (say in sda2) is provoking the 'no symbol table found' error in Ubuntu 16.10?
I wonder what would happen if I deleted partition sda1, expanded sda2 into its space and then tried boot-repair via usb? Or maybe kept all 3 partitions but converted sda1 to ext4. However, I'm reluctant to risk these approaches for fear of not being able to recover my system.