Waiting for lock on registry/.registry.lock when using macports
When using macports to install packages, you might see
1 Waiting for lock on /opt/local/var/macports/registry/.registry.lock
This is due to the macports did not end properly last time.
Try to run this code
1 sudo rm /opt/local/var/macports/registry/.registry.lock
would solve this problem.
I recommend using Homebrew instead of Macports on modern Macs. Check this article to learn how to install it: Apps I Install on My Mac