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How to enable/activate any unity lens on Quantal?

I installed many unity lens on Quantal, using the following command, but none is active on dash.

sudo apt-get install unity-lens-wikipedia 
sudo apt-get install unity-lens-askubuntu 
sudo apt-get install unity-lens-help 
sudo apt-get install unity-lens-utilities 
sudo apt-get install unity-lens-answer

Pressing Super it shows only app/file/music/video lens.

share|improve this question
How did you installed them? From the software center or how? – Lucio Mar 25 '13 at 19:24
sudo apt-get install – Lucian Vidrascu Mar 25 '13 at 19:38
i saw a difference between gdocs lens and others on file name.lens; gdocs has Shorcat=g; the others have Visible=false and Shorcat=; – Lucian Vidrascu Mar 25 '13 at 19:38
Can you mention all the packages that you installed in your question? You can find the last entered commands in your ~/.bash_history file.. – Lucio Mar 25 '13 at 19:40
uciany@lap00:~$ h | grep lens | grep install 452 sudo apt-get install unity-lens-wikipedia 453 sudo apt-get install unity-lens-askubuntu 454 sudo apt-get install unity-lens-help 455 sudo apt-get install unity-lens-utilities 462 sudo apt-get install unity-lens-answers – Lucian Vidrascu Mar 25 '13 at 19:43

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