Same issue on Ubuntu 16.04: sudo add-apt-repository -y ppa:maas/stable
gpg: keyring `/tmp/tmp6wy_3tp8/secring.gpg' created gpg: keyring `/tmp/tmp6wy_3tp8/pubring.gpg' created gpg: requesting key 684D4A1C from hkp server keyserver.ubuntu.com gpgkeys: key 3AB6DCF1F234E78DAA9C104204E7FDC5684D4A1C can't be retrieved gpg: no valid OpenPGP data found. gpg: Total number processed: 0 gpg: keyserver communications error: keyserver helper general error gpg: keyserver communications error: unknown pubkey algorithm gpg: keyserver receive failed: unknown pubkey algorithm Failed to add key. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1779302 Title: should retry reading key from keyserver (in _recv_key) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/software-properties/+bug/1779302/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
