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Password protect GRUB2:

• HowTo password protect GRUB2 on RHEL/CentOS7 (versions 7.0 to 7.1).
• HowTo password protect GRUB2 on RHEL/CentOS7 (version 7.2 and above).
• HowTo password protect GRUB2 on Ubuntu 16.04.
• HowTo password protect GRUB2 on Ubuntu 18.04.

Install on LUKS encrypted LVM:

• HowTo install CentOS 7.7 on LUKS encrypted LVM.
• HowTo install Ubuntu 18.04 on LUKS encrypted LVM.