What is the blue triangle on the home button for?
I just noticed a blue triangle icon on my 'Ubuntu' icon. What could it mean?
Solution 1:
The little blue triangle is an indicator that shows when an application is requesting user attention (for instance, a dialogue pops up).
The triangle is in the corner, and indicates the direction/place that the user needs to move the cursor in order to reveal the auto-hidden Launcher.
See also:
- When do things in the new Unity Panel turn blue?