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I installed i3 desktop environment and then removed it via software manager since I didn't like it very much.

Now I started to use unity (default) back again. However, now I have a white over blue notifications on the upper left of my screen. I usually see them when wifi is connected or I received an email.

This notification also appears on the login screen and does not let me to write my password during the check of preferred wirelesses.

I need to remove this notification thing.

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marked as duplicate by Eric Carvalho, bain, Mitch Jun 25 '14 at 11:43

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Try removing the following packages:

sudo apt-get remove dunst i3 i3-wm i3lock i3status suckless-tools  

Then try:

sudo apt-get autoremove && sudo apt-get update && sudo apt-get install --reinstall notify-osd

That will hopefully clear this up.

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