The problem could be, that in Ubuntu 11.x /bin/sh is linked to /bin/dash and not to bin bash.
check the link:
ls -l /bin/sh
If /bin/sh is a link to /bin/dash, change it to /bin/bash.
sudo mv /bin/sh /bin/sh.orig
sudo ln -s /bin/bash /bin/sh
ubuntu7shad0w
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