**Installation of Grub2**

a) Chroot the filesystem \\
b) Install grub to boot devices /dev/sdd \\
<code bash>grub-install --boot-directory=/media/raid/boot /dev/sdd</code>
With check --recheck option
<code bash>grub-install --boot-directory=/boot/ --recheck /dev/sdd</code>
c) Update Grub Config (Fedora...) \\
<code bash>grub-mkconfig -o /boot/grub/grub.cfg</code>
d) Update Grub Config (Ubuntu...)
<code bash>update-grub2</code>
e) Disable UUID Check \\
<code bash>/etc/default/grub >> “GRUB_DISABLE_LINUX_UUID=true”</code>
e) Disable Splash Screen, edit /etc/default/grub \\
<code bash>GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"</code>
to 
<code bash>GRUB_CMDLINE_LINUX_DEFAULT="quiet"</code>