*Brief: Double clicking on the deb file doesn’t install it via the software
center in Ubuntu 20.04? You are not the only one facing this issue. This
tutorial shows how to fix it.*
On the “things to do after installing Ubuntu 20.04
<https://itsfoss.com/things-to-do-after-installing-ubuntu-20-04/>” article,
a few readers mentioned that they had trouble installing software from the
Deb file <https://itsfoss.com/install-deb-files-ubuntu/>.
I found that strange because installing a program using the deb file is one
of the simplest methods. All you have to do is to double click the
downloaded file and it opens (by default) with the Software Center program.
You click on install, it asks for your password and within a few
seconds/minute, the software is installed.
https://itsfoss.com/cant-install-deb-file-ubuntu/