For some reason, the standard backspace does not function as a shortcut for going back a page like it does on Windows. While this is a replacement on Ubuntu, it certainly still works on Windows.
ALT + left-arrow for back and
ALT + right-arrow for forward.
Chrome does not expose this shortcut in any visible way. Yet using left and right for back and forward makes a certain intuitive sense. It’s fast and easy, and it keeps your hands where they need to be – on the keyboard.