For posterity: I believe this to be a bug in debootstrap that was caused by an update to the ubuntu-keyring package [1] that received no corresponding update to the debootstrap 'configuration' files [2].
To summarize: - This affects Ubuntu <= 12.04 chroots on Ubuntu >= 17.04 hosts. - The best workaround that I know of is the following command: sudo debootstrap --keyring=/usr/share/keyrings/ubuntu-archive-removed- keys.gpg precise /tmp/precise http://old-releases.ubuntu.com/ubuntu/ The important bit is the non-default --keyring argument. [1] https://bugs.launchpad.net/ubuntu/+source/ubuntu-keyring/+bug/1363482 [2] https://bugs.launchpad.net/ubuntu/+source/ubuntu-keyring/+bug/1363482/comments/7 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/599394 Title: Release signed by unknown key (key id 40976EAF437D05B5) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/pbuilder/+bug/599394/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
