After I ran “apt-get dist-upgrade” and encountered an unexpecting exit, rerunning “apt-get dist-upgrade” gives me the following issue:

From here.

Nix is a powerful package manager for Linux and other Unix systems that makes package management reliable and reproducible. I install Nix to use boot.

From here and here.

WebSocket is a computer communications protocol, providing full-duplex communication channels over a single TCP connection. It is designed to be implemented in web browsers and web servers, but it can be used by any client or server application.

“cool-retro-term“ is a terminal emulator which mimics the look and feel of the old cathode tube screens. It looks familiar for the “old” people like me who have even seen the old enough monitors like this:

Newsbeuter is an open-source RSS/Atom feed reader for text terminals.

When I was running “sudo apt-get update” and a sudden power off happened. After restarting Ubuntu, I find the following error after running “sudo apt-get update” again: