Source: https://community.letsencrypt.org/t/how-to-stop-using-tls-sni-01-with-certbot/83210

Just update my Linux kernel from version 4.15.0 to 5.3.0 on Ubuntu 18.04 LTS and facing this problem. When unlock my desktop after screen turn-off, a "ghost" cursor showing up on my desktop and stuck there.