where to get full featured IG client for ubuntu

Instagraph is an unofficial native Instagram client which is packaged as a snap package in all currently supported versions of Ubuntu. To install it open the terminal and type:

sudo snap install instagraph 

Features:

• customizable Instagraph feeds
• make photo collections
• multiple edit options
• video live possible

Instagram Direct (icon with the red message notification) is not available in the Instagram desktop web app.

There is another Instagram desktop app (sudo snap install istekram) that says that it supports Instagram direct messaging, but istekram is lightweight and not full-featured. It's just a simple HTML wrapper for Instagram built with Electron.