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I don't know what happened, but Unity will not search for applications. So I searched for a solution and found this answer, which was:

sudo apt-get install unity-lens-files unity-lens-music unity-lens-applications

However, when I did that, I got:

E: Unable to locate package unity-lens-application

I am rather new to Ubuntu, so I don't know how to fix this.

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Looks like a typo, the package is unity-lens-applications the error you are getting is showing unity-lens-application. Try again, copy paste carefully. – Basharat Sial May 25 '12 at 20:42
@Basharat Well, I feel stupid now, and it successfully installed, but it did not solve my problem. However, I got a system error saying something about nautilus. – Ben May 25 '12 at 20:58
Try running apt-cache search unity-lens to find all of the unity-lens packages. – Barton Chittenden May 25 '12 at 21:10
@Basharat Yes, I did restart the computer. That's when the error appeared. – Ben May 25 '12 at 22:14
@Barton It says I have the application lens. The problem still has not been resolved. – Ben May 25 '12 at 22:14
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1 Answer

Same problem with my Ubuntu 11.10. Yesterday search applications was working and today no application listed. However it still launch an application I would type in. I perform updates daily on my system.

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