This tutorial will learn a method how to login into Ubuntu 12.10 using USB flash drive. This can be accomplished by use of PAMUSB (Pluggable Authentication Modules USB) and some sort of USB storage device such as USB memory stick, mobile phone with SD card attached. It is compatible with many display managers ((LightDM, GDM, MDM and other DM)
If you’ve set up the USB flash drive, you can use your USB flash drive to store and enter your password automatically. It is secure, automatic and fast. Log-on user name and password are automatically entered as soon as you plug in the USB drive and click Log In. Follow the step-by-step to setup USB flash drive for login into Ubuntu 12.10