How do I restore the original color scheme, icons, and theme?

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 the unity --reset command. It never completes. I gave it 20 minutes.

Solution 1:

Open terminal Ctrl+Alt+T and run following command:

Reset Icon Pack

gsettings set org.gnome.desktop.interface icon-theme ''

Reset Theme

gsettings set org.gnome.desktop.interface gtk-theme ''

gsettings set org.gnome.desktop.wm.preferences theme ''

gconftool-2 --set --type string /apps/metacity/general/theme ''

Reset Launcher

gsettings reset com.canonical.Unity.Launcher favorites

Reset Panel

gsettings set com.canonical.Unity.Panel systray-whitelist "['all']" 

After run this command logout and login back.