Hit:1 http://archive.ubuntu.com/ubuntu focal InRelease
Hit:2 http://archive.ubuntu.com/ubuntu focal-updates InRelease
Hit:3 http://security.ubuntu.com/ubuntu focal-security InRelease
Reading package lists... Done
Building dependency tree
Reading state information... Done
All packages are up to date.
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cat /etc/apt/sources.list. – Error404 Oct 15 '21 at 15:29Get:3 http://security.ubuntu.com/ubuntu focal-security InRelease [114 kB]
Hit:4 https://packages.microsoft.com/ubuntu/20.04/prod focal InRelease
Fetched 228 kB in 1s (174 kB/s)
Reading package lists... Done – Olga Berkovich Oct 15 '21 at 15:36
sudo apt updateensures the software lists on your system are up-to-date (ie. what packages you can download for your current release using current sources configured on your box). It does not actually perform the upgradeapt upgradeorapt full-upgradedoes that, and does not move you to a later release (do-release-upgradeand other tools do that) – guiverc Oct 15 '21 at 22:06