By Pei JIA
Following https://www.digitalocean.com/community/tutorials/how-to-upgrade-to-ubuntu-22-04-jammy-jellyfish to upgrade Ubuntu but failed with the following ERROR message.
After updating your package information, the essential package
'ubuntu-minimal' could not be located. This may be because you have
no official mirrors listed in your software sources, or because of
excessive load on the mirror you are using. See /etc/apt/sources.list
for the current list of configured software sources.
In the case of an overloaded mirror, you may want to try the upgrade
again later.
So, how should I modify /etc/apt/sources.list in order to install jammy from focal?
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