Are you sure you booted from the usb and didn't use wubi? Your log files show that there was a damaged ext2 filesystem mounted on /dev/loop1. If you can repeat this, can you open a terminal and run the following commands and post the output:
df sudo losetup /dev/loop1
Are you sure you booted from the usb and didn't use wubi? Your log files show that there was a damaged ext2 filesystem mounted on /dev/loop1. If you can repeat this, can you open a terminal and run the following commands and post the output:
df
sudo losetup /dev/loop1