Ubuntu is phasing out the notification area (a.k.a. “system tray”), because of its ineffectiveness at notifying people of things, and its inconsistent behavior. Many programs that previously used the notification area should use other notification mechanisms instead
Insert into ~/.bashrc and reload afterwards: source ~/.bashrc
PS1='${debian_chroot:+($debian_chroot)}\[\033[41;33m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[00m\]\$ '