when I run $sudo apt update. It always shows me the "connection timed out" error.At the same time, I can surf on Internet but the mark of net connection condition always gives a "?". How can I fix them?

  • The error message usually mention the repository or repositories that failed to connect. – user880592 Oct 13 '18 at 7:58
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    Please update your with the full output of sudo apt update – Soren A Oct 13 '18 at 8:29
  • @li ma i think it should be sudo apt-get update not sudo apt update – Gaurav Gupta Oct 13 '18 at 12:48
  • @GauravGupta apt or apt-get both work in 16.04 and newer. See man apt. – user535733 Oct 13 '18 at 12:53
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    Are you using a proxy network ? – Hirak Oct 23 '18 at 15:48


 echo "nameserver" >/etc/resolv.conf

or changing the download server in Software & Updates


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