Inserting the USB drive should auto-mount it. If it is not there, then you can install it using the Synaptic Package Manager or Ubuntu Software Center You can find usb-creator-gtk in the Unity Dash by typing 'Startup Disk Creator' (Ubuntu Desktop) or usb-creator-kde in K-Menu->Applications->System->Startup Disk Creator (Kubuntu). 'Unetbootin' or 'mkusb'), if you want to create a USB boot drive with another Linux distro (alias Linux operating system). The Ubuntu Startup Disk Creator is dedicated to creating USB boot drives for Ubuntu and Ubuntu family flavours (Kubuntu, Lubuntu. Install and run Startup Disk Creator alias usb-creator
Install and run Startup Disk Creator alias usb-creator.Creating a bootable Ubuntu USB flash drive from Ubuntu.
