Help installing Mint 17 in place of Mint 15 on dual boot with windows7
A short while ago I installed Linux Mint 15 as dual boot with windows 7 on my laptop, but now I am trying to install Mint 17 over the top of 15, but I am very confused and don't understand what to do after I choose "Other Option" during the installation. I clicked on the relevant drive which had 15 on it, but it tells me "no root file system defined". Can someone tell me exactly what I need to do to install Mint 17 in place of Mint 15. Each time I press "Install" it throws up messages, and I have no idea when any of it means and what options to choose in the drop-down boxes. Some step by step instructions would be helpful. I found it so easy to install the Mint 15, so I was surprised to encounter complications when I wanted to replace it with 17.