Comment 140 for bug 1274320

After installing 2.02~beta2-9ubuntu1.7 on Trusty, I had to set execute right on /etc/grub.d/00_header. Now it works normally with my lvm system partition.

So enable proposed repository, and then:
sudo apt-get install grub-efi-amd64/trusty-proposed -t trusty-proposed
sudo chmod +x /etc/grub.d/00_header
sudo update-grub2