Why can't update Ubuntu?

Question

ubuntu

I'm trying to upgrade from 19.10 to 20.04, but the new version is not found.

Answer 1

You check for a development release (-d) and try to upgrade to stable.

Answer 2

install update-manager
and do update-manager -d
or edit sources.list
sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak
sudo sed -i 's/eoan/focal/g' / etc/apt/sources.list
sudo apt update
sudo apt dist-upgrade
if you often need to edit the list do dpkg --configure -a and sudo apt dist-upgrade -f
but after ~5 times everything goes
away and yes ppa has to be edited manually