After installing Lubuntu on an old Dell, i was expecting a similar user experience from full Ubuntu with a Unity desktop environment, where I would need to spend many extra hours tweaking the install. Little did I know. Ubuntu is easier to install and use, by far.
My Lenovo w510 came with Windows 7, which I still want to keep. By adding another disk I could boot to the new Ubuntu disk, and then have a choice to stay in Ubuntu or boot to Windows. A dual boot install was required. There is a lot of help online about installing a dual boot using two disks.
