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I am experiencing an issue when updating packages. I get the following error message:

server certificate verification failed. CAfile: /etc/ssl/certs/ca-certificates.crt CRLfile: none

If I manually enter the package link:

https://download.docker.com/linux/ubuntu/dists/xenial/stable/binary-amd64/Packages

into the web browser, I get the red HTTPS not secure message with the ERR_CERT_AUTHORITY_INVALID message. However, if I enter the package link in the web browser of another computer, it loads with no problems.

What I have tried to fix it:

  • Checking that my time is correct and synchronized using NTP
  • Updating the root certificates using:

    update-ca-certificates

    update-ca-certificates --fresh

  • Reinstalling root certificates using:

    apt-get install --reinstall ca-certificates

However, this did not fix the problem.
Is there anything else I can do to fix the problem?

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It turns out that the issue was not with the certificates. The default gateway of the Ubuntu box is running a transparent proxy and after adding the Ubuntu box to the addresses that bypass the proxy, this fixed the problem.

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