I am fairly new to Ubuntu. I have 14.04 LTS installed and it used to work just fine. Since recently however, whenever I want to open an application, Dash doesn't show the application but just some files and irrelevant stuff.
1 Answers
It sounds like you opened the dash by hitting Super. However, this opens the home page of the dash which provides usually both files and applications as s search result.
You have to use the Applications lens to search for your programs. You can get there by opening the dash (hit Super or click on the Ubuntu symbol at the top of the launcher bar on the left side of your screen) and then clicking on the A symbol at the bottom of the dash.
Alternatively, you can use the keyboard to navigate between the lenses: Ctrl+Tab to go right, Ctrl+Shift+Tab to go left.
You can also directly enter the dash's application lens by right-clicking on the Ubuntu icon at the top of the launcher and selecting "Applications" in the context menu or by hitting Super+A instead of Super only.
I hope this is what you looked for. Don't hesitate to accept the answer by clicking on the gray tick on the left if it solved your problem. Otherwise leave me a comment, please.

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i used the applications lens but it already says "sorry,there is nothing that matches your search". and when i type in something, still nothing. – Anil Kumar Feb 18 '15 at 16:30
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Did you do a reboot since the error occurred the first time? I had a similar issue once and it just vanished after a clean reboot. Always remember: reboot = first aid – Byte Commander Feb 18 '15 at 18:37
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yes, its been some weeks since this first happened – Anil Kumar Feb 18 '15 at 19:18
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You could try to reset your Unity settings as described there. Maybe even a reinstall of Unity/Compiz might be of use (link), but try this as last option before a complete fresh install of the whole system... – Byte Commander Feb 18 '15 at 19:32