Hi!
Try this without --namecoin:
sudo python ./pywallet.py --recover --recov_device /path/to/corrupted_wallet.dat --recov_size 1Mo --recov_outputdir /home/username/Desktop/recovery
What does it return? What is "no success"?
And how did you find 8 "ckeyA"? How many "ckey" do you find?