$ sudo apt-get update
$ sudo apt-get install libappindicator3-1 

libappindicator3-1 is installed in your system.

Make ensure the libappindicator3-1 package were installed using the commands given below,

$ sudo dpkg-query -l | grep libappindicator3-1 *

You will get with libappindicator3-1 package name, version, architecture and description in a table

libappindicator3-1 package basic information: