Change Ubuntu dash shell to bash shell

Starting from Ubuntu 6.10, UBUNTU replaces the default bash shell with the dash shell. It shows that the/bin/sh link is down with/bin/dash instead of the traditional/bin/bash.

Ubuntu edgy is the first version released with Dash as the default shell, which seems to be affected by Debian. There is an official explanation in the Wiki, https://wiki.ubuntu.com/dashasbinsh. the main reason is that dashis smaller, runs faster, and is compatible with posix.

However, the current problem is that the shell replacement causes many script errors. After all, many of the current scripts are not 100% POSIX compatible.

We also mentioned in the Wiki that the method to change the default shell back to bash is

Run sudo dpkg-reconfigure dash on the terminal

Then select No.