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I tried to install Firefox – I deleted the version 4 in hope to install firefox 5 later – but got this error

libnss3-ld dependency ...

I decided to do this

sudo apt-get install libnss3-ld

and went away. When I came back this command had deleted almost everything, drivers, programs, et cetera.

I never thought that apt-get install could delete anything.

Why did it happen?

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1  
It shouldn't delete anything, unless you give it the -y option, and even then it wouldn't remove essential stuff. What exactly has been deleted? – slhck Aug 17 '11 at 13:23
    
all programs, network driver, that's when I pressed Ctrl+C – Sergey Aug 17 '11 at 13:36

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