There are some error in the description of release notes about update-manager -c
correct command to upgrage is
update-manager -c -d
Thanks, but -d would be a bad idea since it's usually to upgrade to development releases. In future, a new cycle will start for 20.10 and users following this advise would end up on the wrong version. 
See also:
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Okay, it seems I got a little confused. My apologies. 
By design, Ubuntu updates can only happen to the next release so:
- 18.04 LTS → 18.10 or 20.04 LTS
- 19.10 → 20.04 LTS
But not:
- 18.04 LTS → 20.10
- 19.10 → 20.10
So actually, you're right in that we need -d. Though, the -d won't be necessary once [somebody or robot] at Canonical HQ enables updates to show in Software Updater. Currently it doesn't show for me in 19.10, and I know LTS releases wait for the first point release (.1)
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Well i see your post
great!
Interesting discussion about the -c -d here: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1875522
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