If it is not running, check whether there are .certbot.lock files in your system.
find / -type f -name ".certbot.lock"
If there are, you can remove them:
find / -type f -name ".certbot.lock" -exec rm {} \;
If it is not running, check whether there are .certbot.lock files in your system.
find / -type f -name ".certbot.lock"
If there are, you can remove them:
find / -type f -name ".certbot.lock" -exec rm {} \;