I am using Ubuntu 16.04 LTS (very happy with it so far), but I am facing a really weird issue. It's not impossible that I have changed a setting somewhere to break it, but I cannot find such a setting anywhere.
When I launch the Files application (Nautilus) I do not see the application in the launcher (the left panel). When I Alt+Tab I see all other apps (except minimized), but Files is also missing. The app is not minimized.
Best Answer
If you open Nautilus and navigate to
/usr/share/applications
you will see some files named 'Files'. In the Nautilus window you will not see their filenames unfortunately you will see this:If you first drag each file onto a
gedit
window you will be able to identify the files as:nautilus.desktop
nautilus-folder-handler.desktop
org.gnome.Nautilus.desktop
All you need to do is to drag the one named
org.gnome.Nautilus.desktop
over onto your left panel launcher and simply drop it there. All should be well :)