My first thought is: there's something wrong with your debian.img.ext2 file.

All of your "mount failed" errors are very likely due to the fact that your debian image file isn't mounting properly in the first place, which causes all the other stuff to go south.

First, you need to know where your debian.img.ext2 file is. It should be something like /media/mmc2/debian.img.ext2 or /media/mmc1/debian.img.ext2 so substitute the right one in the commands that follow.

1. Reboot. This makes sure you've got nothing chroot-related mounted.
2. Open a terminal. Type the following (substitute your correct path for /media/mmc2/debian.img.ext2)
3. Please post the results of those commands. Just so you know, the "ls /debian" command should produce lots of stuff. If it doesn't, then that might be your problem.