Problem installing certbot on ubuntu 16.04

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:
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.)

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