I purchased a pretty average laptop with the goal of installing various flavors of Linux on for testing. (Log in to hide this advertisement) The PC came with Windows 10. I first installed the latest Ubuntu LTS install onto a new partition, worked well and have been using for a couple of weeks. Today I had need to install CentOS, which also installed and worked well on a new partition. The issue now is when I choose to boot Ubuntu on start up I get these errors: error: can't find command 'linux' error: can't find command 'initrd' Click to continue... Any idea how to fix or what I could have done wrong during the CentOs install? I'm okay at using Linux but don't have a lot of experience in installing Linux OR multi-boot scenarios.