I'd like the original colour scheme, icon style of 12.04.

I somehow lost the Ambiance theme (possible error or upgrade error). I re-installed 'light-themes' from the terminal and got it back.

But the panel on the top that shows the options of sound, battery and wi-fi has changed and I can-not get the original setting back.

In the windows, the close, minimize tools have shifted to the right instead of the original left side.

I had installed MyUnity and Ubuntu Tweak but deleted them. As such, I want the original setting back.

Kindly help me with the commands.

I have searched for solutions; there are multiple and I need to be sure if I should follow the same. Kindly bear before marking duplicate.

Discoveries *. [The appearance is gray and boxy as outlined here.]

Not sure same problem.

*. [Similar 'gray and boxy' article here]

*. Desktop forgets theme.]

*. I have also tried unity --reset command. It never completes. I gave it 20 minutes.