Sep 22 18:49:14 ubuntu kernel: [  740.573253] SQUASHFS error: zlib
decompression failed, data probably corrupt

I'd suspect a problem with the .iso file or something went wrong when writing 
to USB. If you downloaded the .iso manually (not using a torrent), then make 
sure you check the sha256 sum of the file to ensure it's not corrupt.
http://releases.ubuntu.com/focal/SHA256SUMS

If you are using Linux: 
https://ubuntu.com/tutorials/how-to-verify-ubuntu#1-overview
If you are using Windows: 
https://www.shellhacks.com/windows-md5-sha256-checksum-built-in-utility/

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https://bugs.launchpad.net/bugs/1896656

Title:
  problem with installer

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