Partitioning your hard drive is part of the process and could affect your current data. Make sure to back up your system completely before you begin. Depending on the arrangement, you may need to ...

Dual-booting once reigned supreme, but virtual machines have taken the crown with their isolation, security, and convenience.

Something went wrong during the install causing GRUB not to be properly configured it sounds like. You could try fixing it, but I'm no expert honestly. I'd just ...