hi. trying to follow the installation instructions of “Unspecified Webserver on Ubuntu 16.04 (xenial)”, i hit a problem on
sudo add-apt-repository ppa:certbot/certbot.
More info: https://launchpad.net/~certbot/+archive/ubuntu/certbot Press [ENTER] to continue or ctrl-c to cancel adding it gpg: keybox '/tmp/tmpxg054hih/pubring.gpg' created gpg: /tmp/tmpxg054hih/trustdb.gpg: trustdb created gpg: key 8C47BE8E75BCA694: public key "Launchpad PPA for certbot" imported gpg: Total number processed: 1 gpg: imported: 1 gpg: no valid OpenPGP data found. [Errno 2] No such file or directory: 'S.gpg-agent.extra'
googling around, i ran into a suggestion. doing that (for the above key id) seems to have solved my problem.
(i hope the formatting is okay here.)