After refreshing Squid cache by the commands above the upgrade works normally on both archive.ubuntu.com and ru.archive.ubuntu.com . So it was my personal problems with my squid-deb-proxy server.
I'm sorry for the buzz. ** No longer affects: apache2 (Ubuntu) -- You received this bug notification because you are a member of Ubuntu Server/Client Support Team, which is subscribed to apache2 in Ubuntu. Matching subscriptions: Ubuntu Server/Client Support Team https://bugs.launchpad.net/bugs/1888058 Title: Got “Authentication failed” while running do-release-upgrade from 19.10 to 20.04 LTS with proxy configured To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1888058/+subscriptions -- Mailing list: https://launchpad.net/~enterprise-support Post to : [email protected] Unsubscribe : https://launchpad.net/~enterprise-support More help : https://help.launchpad.net/ListHelp
