Take the 2-minute tour ×
Ask Ubuntu is a question and answer site for Ubuntu users and developers. It's 100% free, no registration required.

I am running Ubuntu 13.04 with KDE. Today, Software update notification indicated security updates containing updates to libfs6, libx11-6, libx11-data, etc.

When proceed with the updates, it asks for my password and then gives a message:

The following pieces of software cannot be verified. WARNING: Installing unverified software represents a security risk, as the presence of unverifiable software can be a sign of tampering. Do you wish to continue/ cancel

I have, of course, canceled updates. What could be the issue/ how do I set it right? More importantly, is my system hacked/ compromised?

share|improve this question

1 Answer 1

up vote 2 down vote accepted
+50

I think this means that you have an old copy of Ubuntu's APT keys (used to verify that the packages you're installing are legit); you probably have not been hacked. Does it continue to happen after a sudo apt-get update to get the latest keys?

Here's a basic intro: http://wiki.debian.org/SecureApt

Another problem you may encounter if using testing or unstable is that if you have not run apt-get update lately and apt-get install a package, apt might complain that it cannot be authenticated (why does it do this?). apt-get update will fix this.

share|improve this answer
    
Perfect. sudo apt-get update did the trick. –  deshmukh Jun 10 '13 at 15:12

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.