When Ubuntu changed to Grub 2 a couple of releases ago, it became significantly more difficult to set up multi-boot Linux systems. Most if not all Ubuntu derivatives are also using Grub2, and now the ...
Who needs a separate distro when you can tweak the Debian you already have?
Unless your computer is pretty old, it probably uses UEFI (Unified Extensible Firmware Interface) to boot. The idea is that a bootloader picks up files from an EFI partition and uses them to start ...
Firmware, encryption, and filesystem traps that break dual boot.