WARNING: The 'dash' shell which is used as /bin/sh on some Linux system (Including Ubuntu 8.04) makes the 'Cancel' and 'Update'
buttons fail in mcgui. Possible solutions are:
If your system is a Debian or Ubuntu, please run the command
dpkg-reconfigure dash and say 'no' to install dash as /bin/sh (See section 4.1)
If your /bin/sh is dash, please install bash and manually change the /bin/sh link to point at bash.