A command line method to upgrade your installation of Ubuntu to a new release (new releases happen every six months, in April and October) is using do-release-upgrade:
$ wajig update
$ wajig distupgrade
If for some reason that is problematic then the traditional upgrade
path is simply to edit the
/etc/apt/sources.list file to
identify the new repository. There may be further files in
/etc/apt/sources.list.d/ that also require updating.
In the following example the distribution is updated from bionic to focal.
$ sudo apt update; sudo apt install python3-pip
$ sudo pip install wajig; wajig update; wajig distupgrade
$ sudo perl -pi.bak -e 's|bionic|focal|g' /etc/apt/sources.list
$ wajig update; wajig distupgrade
This approach works but is not generally recommended.
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