Also, what would be the right way to configure the boot manager?
More info needed. One hard drive, or two or three? What size hard drive? Is Windows installed? Is it the first partition on the hard drive?
For example, if you have Windows installed, its master boot record will be on the beginning of the hard drive. If you add a Linux installation to the same drive, you can include the Windows installation in the GRUB setup and overwrite the Windows MBR. You can then boot Linux or
Windows from the GRUB bootloader. But
, if you reinstall Windows in the future, the GRUB MBR will be overwritten by Windows, and you won't be able to boot to Linux without fixing GRUB.
What is your hard drive setup? How many and how large? What do you intend to do, both now and in the future? One Windows, one working Linux and one test Linux? Or what?