I am trying to upgrade from Ubuntu 19.10 to Ubuntu 20.04 but when I run the update, in the second stage this error pops:
Invalid package information
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.