Hi, possibly a NOOB post. I have an old laptop with ubuntu currently installed. I'm trying to install CorePlus instead. When I run the installer (from a USB stick) I get a message at the end saying: 'sda appears to have a partition already mounted! Check if correct device. If so, unmount it and then run the installer again'.
I've tried to unmount SDA and have been unable to.
I want to completely get rid of Ubuntu - I don't need to save any data. Any guidance greatly appreciated.