Bashrc

By modifying the /etc/bash.bashrc file you can do a lot of funny stuff to bash

nano /etc/bash.bashrc

By default it should be like

[ -z "$PS1" ] && return
shopt -s checkwinsize
if [ -z "${debian_chroot:-}" ] && [ -r /etc/debian_chroot ]; then
   debian_chroot=$(cat /etc/debian_chroot)
fi

And we modify it into:

[ -z "$PS1" ] && return
shopt -s checkwinsize
if [ $(id -u) -eq 0 ];
then
PS1="\\[$(tput setf 5)\\]\\u@\\H:\\w #\\[$(tput sgr0)\\]"
else
PS1="[\\u@\\h:w] $"
fi

If you want to allow bash for all users, modify

 /home/%USERNAME%/.bashrc

and remove the number sign (#)

 force_color_prompt=yes

When tab (auto completion) does not work in "interactive shells" (e.g. ssh)

Uncomment the following lines.

# enable bash completion in interactive shells
#if [ -f /etc/bash_completion ] && ! shopt -oq posix; then
#    . /etc/bash_completion
#fi

Like so

# enable bash completion in interactive shells
if [ -f /etc/bash_completion ] && ! shopt -oq posix; then
    . /etc/bash_completion
fi

We close the connection and restart. Auto completion should function properly.