Ubuntu’s popularity often makes it the default choice for new Linux users. But there are tons of other Linux operating systems that deserve your attention. As such, I’ve highlighted some Ubuntu alternatives so you can choose based on your needs and requirements—because conformity is boring.
I mean anything but the atomic distros will dual boot just fine. GRUB is GRUB. I have the most experience with Debian-based distros, but they all dual-boot just fine.