How can I install .deb files that look like a sealed box in the file folder to install on my ubuntu 16.04 lts desktop

Question

i have successfully downloaded a file, but the file does not open when in the folder, these are all .deb files and the icon is like a sealed box,

Answer 1

The .deb file is an application install package. The sealed box you see is a visual showing it's a package.

You can install the package by double clicking on it.

When you double click the file, it should bring up the software center and give you a graphical interface with a button to click install.

You can also right click on the icon and choose the install program installer to run.

Alternately you can install a deb package from the commandline with:

$ sudo dpkg -i [packagename.deb]