Ubuntu Grub headaches

Today I had to install an Ubuntu 14.04.2 LTS system on a two-disk PC, with software RAID1, which I did many times before.

The disks and raid setup went fine, but when reaching the GRUB install it reports “fatal error”.
I skipped the bootloader install and finished the OS setup. Of course, the system didn’t boot…

After a little googling, I can resolve all booting problems.

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