If you don't care about the previous data, just boot into rescue mode, and use fdisk to write a clean empty partition table to the disk, then reboot into installation mode. That's cleared up some issues for me in the past.
Dan W. > > > Error informing the kernel about modifications to > > > partition/dev/sda5--Device or resource busy. This means Linux > > > won't know about any changes you made to /dev/sda5 until you > > > reboot--so you shouldn't mount it or use it in any way before > > > rebooting.
