Ubuntu Software Center Does Not Have APT Repositories Applications

[mahesh]

Greetings!

1) How do I search and install applications from APT repositories in Ubuntu Software Center? I searched for applications like "preload" and "apache" and they do not turn up in the search results. They are available on terminal "apt search" results.

2) I downloaded Google Chrome deb and installed it (double click on the file) through Ubuntu Software center installer. However, subsequently it does not appear in my Ubuntu Software search results. In this case, how do I uninstall it or update it through Ubuntu Software center?

Thank you in advance for your replies!