I'm relatively new to Ubuntu, and am running into a problem I've not seen before. This is on an Ubuntu 12.04 system. I can't find Screenshot. I'm trying to take a shot of a screen from a web page, go to Dash, type in Screenshot, and nothing shows up. I've done this many times before, but suddenly Screenshot is not found.

I downloaded an app called Shutter, it seems to have installed just fine, but like Screenshot, I don't know how to find it. Dash reveals nothing. In Dash, I've noticed that I have no applications showing up in response to a search. For instance, I can type Firefox, and get no results either, even though I'm using Firefox to submit this question. Is there something I can do to get Dash to show applications? Search results show only files and folders, and downloads.

I did find one answer on Ask Ubuntu, which gave the following instructions: None of these fixes worked for me. But after more searching:

rm ~/.cache/software-center -R

worked like a charm. I did need to run:

unity --reset &

afterwards though, for the changes to take effect within dash, but the software center just started working straightaway.

However, when I issued the unity --reset & command, it resulted in an internal error, and I'll have to reboot in order to reset my computer (which fortunately is allowing me to complete this question).

So I'm still wondering why applications won't show in Dash, and will appreciate any help.