apt update fail

Failed to fetch http://br.archive.ubuntu.com/ubuntu/dists/focal-updates/main/dep11/Components-amd64.yml.xz File has unexpected size (274756 != 274728). Mirror sync in progress? [IP: 2801:82:80ff:8000::5 80]

Most likely, you happened to run the command while the Regional Server you are using was syncing.
There may be other causes- which are easy to fix, too.

But for now, let's focus on that most likely one.
Please launch Software & Updates
On the first open tab ; Software
Ensure that the Top Four Boxes are checked to ON.
Please set "Download from" to Main Server in the drop down menu.

Reboot and test.

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