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First the machine only had Ubuntu 18.04, this operating system was installed on the ssd. I wanted to dual boot with Windows 10, so I made a bootable usb and installed it on the HD. Everything I read said that installing windows would erase Ubuntu and I would need to start again from scratch, but that didn't happen. I can change the boot order in the BIOS and the computer boots from Ubuntu again!

This is really good because I don't want to install everything all over again, but I also don't want to mess around in the BIOS to switch OS.

Can I install a boot loader like grub to make the switch easier? I can't see how to install just the boot loader on it's own, all the instructions seem to assume you are installing another os.

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Ubuntu always installs GRUB, so you already have it installed. It may not be aware of Windows, though. Use the command sudo update-grub to fix this. Then change the boot order either through UEFI setup or from Ubuntu. Done, you'll boot into GRUB by default with ability to boot either Ubuntu or Windows.

If you want to have a graphical boot menu, rEFInd is really nice.

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