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Here is the schema I used for a machine with a 500GB drive:Here is the schema I used for a machine with a 500GB drive that will be LAN connected to a network with a NAS device: Install Grub2 on the MBR. After the installation is completed then reboot and check to make sure it is well. Insert the USB drive for the second installation and reboot. Installation of the second linux again do not let it auto partition the disk. Do not install Grub2. Mount / (root), swap and /share.* Both installations will use the same swap partition and will both share the /share partition