"-sh: file: not found" is the result or "apt-get" failing to install it. You may notice "Could not resolve host" in your output. That means your repositories are set up correctly but you had some temporary network glitch and failed to download the package. Keep trying until you succeed.

BTW, my mentioning Android was not just a coincidence. We went on holiday last year with another family and to save time later, I wanted to use my Android tablet to copy pictures from one camera to the other. So I took the memory card from my camera, put it in a USB card reader and plugged it in the tablet. The tablet said, "Initializing memory card", and after that, all my pictures were gone. When the first panic subsided, I found them all in the FOUND folder like in yur case. All I had to do was rename *.CHK to *.JPG. I went one step further and renamed FILExxxx.CHK to DSCNyyyy.JPG but that's only because I am such a pedant.

This one is probably your best bet. It should fix 80% of your files. The rest may be identifiable by the file command others have been telling you to use. But if you're using some obscure program (like "Family Tree Maker" or "Disney Fingerpaint Studio") it may not figure out those files.

Your best bet is to copy the whole FOUND.000 folder to your PC, then use something like UnChk. You can use the commands here to figure out most of the rest. What few the file command can't auto-detect are probably either corrupt or something very custom. But there should be very few of those overall.

Good luck.

PS: In the future, you may want to consider backing up "vital" data in more than one location.

Thanks Alot guys finally after 24 hours of hard work i got .CHK files, now m going to convert there files, but most of them are still not working but headache is reduced upto some Extent.
AGAIN THANKS ALOT TO ALL OF THOSE WHO GAVE ME THEIR PRECIOUS TIME. LOVE YOU GUYS, MAY GOD BLESS YOU.

Good you had success! May I request you mark the thread as solved for future reference?