Ask Ubuntu is a question and answer site for Ubuntu users and developers. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

Pressing and holding Alt + scrolling with the mouse wheel used to give me a transparent window, is there any way I can get that or something similar in Ubuntu 12.04?

share|improve this question
up vote 26 down vote accepted

Install these pacakges with this commands

sudo apt-get install compizconfig-settings-manager compiz-plugins-extra

This will install the CompizConfig-Settings-Manager, you can find this by searching as CCSM in the dash.

Open the CompizConfig-Settings-Manager by typing ccsm in the dash. In the CCSM's window, under the Accessibility section, enable the Opacity, Brightness and Satuaration by placing a tick mark on the corresponding checkbox.


This should automatically enable the plugin, if it is not, press Alt+F2 and type compiz --replace.

Now you can increase or decrease the transparency of any window by holding the Alt key and scrolling mouse wheel.

If Unity seems crashed, don't be bothered. Press Ctrl+Alt+Del to bring logout window, and press Enter to logout from your session. Then login again.

share|improve this answer
@Eccentric_Geek A little nice tutorial, on how to do it per app: – Radu Maris Feb 18 '13 at 11:53
@Anwar Shah, immediately after I press Alt+F2 and type compiz --replace(otherwise the opacity doesn't work) the x(close) ,minimize and resize from top-right of all the open windows disappear and I can't resize any more any windows even with pulling the margins with the mouse, and the alt key doesn't work any more in any windows. – XPDIN Apr 24 at 11:08
@XPDIN which version of Ubuntu are you using? There should be a unity --reset command in newer versions of Ubuntu. I'm on 14.04 – Anwar Shah Apr 24 at 14:52
@Anwar Shah For the moment I am using Lubuntu 15.10, tell me please, what should I do? I am Linux beginner user. – XPDIN Apr 24 at 19:07
Can you log out and login again. If not, use ctrl-alt-del key combo. If you still having problem, install compizconfig-settings-manager and in the advanced tab, select unity problem and click reset button. – Anwar Shah Apr 24 at 19:30

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.