Resolution and Notes: You have multiple AD DS sites and at least one is missing subnets this future domain controller belongs to one of those subnets. I want to create a new partition on free space but it always says there is not enough space on the disk. msc and hit the Enter-key to load the Disk Management interface. The solution is to enter BIOS (by pressing a key during startup, either F1 or F10-F12 depending on your computer model), find the option to enable UEFI. Catalina always prompted me to open the encrypted drive which, once opened, would continue the installation fine.
Quit the OS X Mountain Lion installation by clicking the menu item Quit Install OS X.
Release the Shift key when you see the login window, your computer doesn
