unable to setup chroot environment

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Hey there, I just stumbled upon your question with some other issue, and am not a pro on this myself, but I would think that you did not mount your Pi's SD card to /mnt using

sudo mount /dev/sdc2 /mnt

or probably some other path, like "/dev/mmcblk0p2" instead of "/dev/sdc2" (which is what I am using). You can find which path it is by calling "sudo fdisk -l" once without the card inserted and once with it. Spot the difference ;)

Then try to copy again.

Also, if you just want to use ROS on the RPi, have a look at my attempt here: http://answers.ros.org/question/63705/problem-using-the-provided-groovy-rpi-image/#64027 (darn, I'm still not allowed to post links...)