For some reason, they took away the ability to change the title of bash within a gnome-terminal window in the new Linux Mint 18 Sarah. I needed it to identify certain windows.
Add this bit to your .bashrc to get it back:
set-title(){
ORIG=$PS1
TITLE="\e]2;$@\a"
PS1=${ORIG}${TITLE}
}
set-title "\u@\h:\w\$ [THE APPENDED TITLE]"