apt-get update

Package list update, not upgrade Package.

apt-get upgrade

Package list upgrade. not check dependency.

apt-get dist-upgrade[1]

Upgrade the package list to suit the dependency.

Reference

1. sudo apt-get update upgrade dist-upgrade 차이, wonjinho81, Write:2018.10.17, attach:2022.07.18 방문, https://blog.naver.com/wonjinho81/221379267906