Make sure that packagekit service is enabled and started: Snapfuse snap-store.ubuntu-software-local-file Check that by pressing TAB twice after typing on terminal snap: It has been changed from ubuntu-software package into snap-store package, they are not the same thing. You can see for sure your software center now is not your usual software center. In 20.04, Snap becomes the default underlying method replacing the standard Deb in the Software Center and this makes some users uneasy they wish to get back the previous one. Learn more about Snap in Ubuntu Explanation, Wikipedia, and UbuntuBuzz. Snap eases everyone in same way APK eases Android users and developers, that is, everything is bundled inside one file per application.

We use it as alternative way to install software aside from the one, APT, we used for years.

With Snap, one software can be downloaded and got automatically updated by diverse users which before this was impossible. In the diverse GNU/Linux world, Snap is new technology from Ubuntu to deliver software and automate security updates universally to multiple distros.

Ubuntu software center