As in this previous question, my Ubuntu has crashed unrepairably, so I must reinstall. Currently I have a dual boot partition with Windows 10 (working fine) and Ubuntu 15.10 (dead).
My laptop is a Lenovo Yoga 3, which is too narrow to have a USB ethernet cable or a CD drive. Also, I have a flash drive with Ubuntu formatted as an ISO
Imitating the steps of the original installation, used a Windows 10 trick to boot from the hard-drive. But when I click "try ubuntu" it puts the Ubuntu screen and freezes.
Any guidelines for re-installation?