boot fails on dual boot UEFI System

[Gerald Krottendorfer]

I am having trouble with grub ever since.
In an earlier version I could manage that my laptop is able to boot
(see https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1187345 )

However, since an update to version Ubuntu 14.04 boot is crashing again.
Since then I am living with the workaround to interrupt booting and switch into BIOS (by pressing F12) and select a boot option from there.

After my latest update I restarted my Computer.
No Boot possible.
black screen, a terrible beep occurs every 2 seconds.
No possibility to get into BIOS and its boot menu.

after several attempts of turning on / off the computer I got an:
"error: symbol 'grub_term_highlight_color' not found" - error,
 and I reached the grub-rescue shell.

I checked the www for help, nevertheless I failed to boot linux from there.

Somehow I managed to boot the system by inserting a "super grub2 disk" which enabled me to get to the BIOS and boot from there.

************************************************

The system is now up and running, but I am aware, that grub is still not working properly and I will encounter the same problems when rebooting.

Since I never switched to Windows 8 for more than a year, I would be OK with getting rid of it, if it would help to get rid of my boot problems.

In https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1187345 it is recommended to run:
dpkg-reconfigure grub-pc
to solve a similar problem.
However, since I need to run grub-efi, this doesn't work for me.

Question:
    Is there a similar solution for grub-efi that should solve my issue?

Thanks in advance for any help!

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> sudo blkid -o list -w /dev/null
device fs_type label mount point UUID
---------------------------------------------------------------------------------------------------
/dev/sda1 ntfs (not mounted) 8E0E275F0E274017
/dev/sda2 vfat ESP /boot/efi 8A41-0068
/dev/sda3 vfat DIAGS (not mounted) B0A1-D5FA
/dev/sda4 vfat (not mounted) 6031-844D
/dev/sda5 ntfs WINRETOOLS (not mounted) CC3835143834FF50
/dev/sda6 ntfs OS (not mounted) 826EEB9A6EEB84EF
/dev/sda7 swap <swap> 682361fb-1f18-488c-8523-5bb19e91b857
/dev/sda8 ext4 / e01b9ef4-5bb9-42fc-a11e-826469dcacca

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[Gerald Krottendorfer (gerald-krottendorfer)]

=> I posted to bug #1289977.
(post #283, #284).

Although there are many helpful hints there, I could not resolve my issue.

Tx,
Gerald