How to scale title bars and menu in Ubuntu 14.04 or 16.04 with the terminal only

To keep the story short: Out of curiosity I wanted to know how the scale option would look like with value 5.something. Now I'm stuck with a highly oversized system where I can't change anything (because the window, which seems to be fixed in size) is too large so that I could change the scale value.
I get to the window where I can change the screen options, but that window is too large so that I can see the or reach the scale function or even save it.

I have already tried to reset the value using ubuntu on my laptop and counting how many times I have to press the Tab-button and where to change things etc. Since the terminal works, I need a way to reset the scale value to 1 using the terminal. Any other idea that works is fine for me as well.

I'm using the 14.04.1 version.

In a terminal, run:

dconf reset /com/ubuntu/user-interface/scale-factor

It took me some time but it is working again. The solution:

• Use Ctrl+Alt+T to open terminal

• Install dconf editor by running

  sudo apt-get install dconf-editor
  

• Open dconf-editor

  dconf-editor
  

• Navigate to com→ubuntu→user-interface
• Change or reset the *scale-factor** to, for example, 10 or 20 (depends on your system)

I know that the last step can be hard since you may don't see that much if you have a septup like mine (a small slit where you could only see like a few pixel of the text). On my system it's the only value in there though.

Sometimes the desktop can be a little bit wonky and flicker around so you better restart your system.

Refer rubo77's answer on Scale title bars and menu in Ubuntu 14.04 with Gnome for more.