I encountered this and it is quite a common diagnostic error when installing. You may get a Data error in 'casperilesystem.squashfs'. IMPORTANT: Trouble-shooting the Installation (if necessary, if not, skip to step 4).IF you run it from linux, it unstalls, the appropriately abbreviated lubi (and a mac-os rubbish-based installer will be called mubi). Ensure that you select the correct letter drive! This installs “ wubi” (Windows-Based Ubuntu Installer) onto the destination drive, if you run the Universal USB Installer from windows. iso downloaded from the previous step to the destination flash or sd drive letter. Download and use the universal linux installer. Get Ubuntu Installed on the Flash Drive (or SD Card).Almost always, however, at least one ubuntu version will successfully boot. It often can be a challenge and necessary trial-and-error process to see which version is most compatible with your hardware. If you consider an alternative download version, take care to consider the pros and cons of a netbook version (more compact but limited compared to the full desktop version), and an older (outdated by usually more stable) and newer (more up-to-date, but can be decidedly less stable) OS version. Download the appropriate version of ubuntu. If you have a netbook without a CD/DVD-rom drive, this is your only option for installing or re-installing any operating system.

This is a useful procedure to know how to do (to avoid CD/DVDs).

Ubuntu 10.10 universal usb installer