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I always have a red circle in the upper part of my Ubuntu 16.04 screen, and whenever I click it, it says the following:

Error Message

I can tell that Mono is a cause of this problem; I tried to uninstall it but it didn't seem to work! I can't even reach synaptic!

Can't reach Synaptic

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  • Run sudo apt updateon a Terminal to see in detail what the true problem is. There you should be able to spot the errors listed at the end of the process.
    – eridani
    Aug 20, 2016 at 17:26
  • Also relevant: askubuntu.com/questions/760746/…
    – edwinksl
    Aug 20, 2016 at 17:28
  • @eridani Can I edit my question and show you the output of the command sudo apt update ? Aug 21, 2016 at 15:20
  • By all means, the most relevant information you provide, the faster we find a solution. Also, remember to try what edwinksl suggested.
    – eridani
    Aug 21, 2016 at 15:36
  • Yeah, I used the links he provided. What I finally did was replace my Sources List with a new generated one (using repogen.simplylinux.ch/generate.php) . No more red circle! Thank you all very much for your help :) Aug 21, 2016 at 18:21

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