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These are the error messages:

Err:1 https://esm.ubuntu.com/infra/ubuntu xenial-infra-security InRelease
  Could not resolve host: esm.ubuntu.com
Err:2 http://ppa.launchpad.net/deadsnakes/ppa/ubuntu xenial InRelease
  Temporary failure resolving 'ppa.launchpad.net'
Err:3 http://ppa.launchpad.net/ubuntu-desktop/ubuntu-make/ubuntu xenial InRelease
  Temporary failure resolving 'ppa.launchpad.net'
Err:4 https://esm.ubuntu.com/infra/ubuntu xenial-infra-updates InRelease
  Could not resolve host: esm.ubuntu.com
Reading package lists... Done
W: Failed to fetch http://ppa.launchpad.net/deadsnakes/ppa/ubuntu/dists/xenial/InRelease  Temporary failure resolving 'ppa.launchpad.net'
W: Failed to fetch http://ppa.launchpad.net/ubuntu-desktop/ubuntu-make/ubuntu/dists/xenial/InRelease  Temporary failure resolving 'ppa.launchpad.net'
W: Failed to fetch https://esm.ubuntu.com/infra/ubuntu/dists/xenial-infra-security/InRelease  Could not resolve host: esm.ubuntu.com
W: Failed to fetch https://esm.ubuntu.com/infra/ubuntu/dists/xenial-infra-updates/InRelease  Could not resolve host: esm.ubuntu.com
W: Some index files failed to download. They have been ignored, or old ones used instead.
Artur Meinild
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EMPOWER EXCEL
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1 Answers1

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Step1. Check your Internet connection. If it is bad, switch to a local mirror. Also check whether your device is correctly set up to connect to the Internet.

Step2. remove all PPAs and try sudo apt update && sudo apt full-upgrade

Step3. try manually changing xenial to bionic in /etc/apt/sources.list and all files in etc/apt/sources.d, and then sudo apt update. I have not tried this before because this is the "debian way", but it should work. Though as a precaution you should back your files up.

Lily White
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