Following this guide to update to 20.04 https://ubuntu.com/blog/how-to-upgrade-from-ubuntu-18-04-lts-to-20-04-lts-today

Specifically Alternative options to upgrade

sudo update-manager -c
sudo update-manager -c -d

But getting a Authentication failed popup error window. Authenticating the upgrade failed.

Also tried running this line first

sudo apt-get install --reinstall ubuntu-keyring

but no difference.

  • That might be a network issue. Try making sure your download mirror is up and running by typing sudo apt update in a terminal. Should the server be down, you can change it as described here: askubuntu.com/a/1240525/21008 If that doesn't help, please give us the entire error message. Maybe take a screenshot. – Béné May 24 at 20:44

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