Help with GPT

[ha <hiei.arhiva@gmail.com>]

Last few weekends I struggled with the GPT. I've tried to install debian 
7.2 from live DVD (but booting from USB). However, at the end of 
installation I always receive the message "Grub-pc package failed to 
install into /target/", or something like that. Now, I'm aware that I 
can solve this by booting to rescue mode, doing grub-install, chroot 
into the instaled system and simply update grub. However, I'm getting 
really pissed of by this "post-installation tweaking", and my lack of 
knowledge on how to avoid it. So I must humbly ask If someone knows a 
way around this, i.e. how to persuade the debian installer to install grub.