Comment 4 for bug 1550741

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Winfried PLappert (winfried-plappert) wrote :

Circumvention, copied from Bug #1550922:

Set up a config file in /etc/update-manager/release-upgrades.d/*.cfg.

According to http://askubuntu.com/questions/425355/error-authenticating-some-packages-while-upgrade one needs to create a file /etc/update-manager/release-upgrades.d/unauth.cfg with the contents:

[Distro]
AllowUnauthenticated=yes

Tested and works.