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It's always good to backup your system. Try on of the following:
Ctrl + Alt + T
Type this command:
gedit ~/.bashrc
Uncomment the following:
force_color_prompt=yes
After this line:
if [ "$color_prompt" = yes ]; then
Add the following:
PS1='${debian_chroot:+($debian_chroot)}\[\033[01;32m\]\u\[\033[00m\]@\[\033[01;34m\]\h\[\033[00m\]:\[\033[01;35m\]\w\[\033[00m\]\$ '
And comment the line which has been replaced.