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Why my wifi logo have an Exclamation mark on ubuntu

I've had that issue with other versions of Ubuntu. I had similar Theme issues after upgrading to 18.04.

Change the icon theme. You can do this with Gnome Tweaks.

It's not installed by default. Install it with:

$ apt install gnome-tweak
From there click on Appearance -> (click) Icons. Then select a different theme.

I've seen occasions where changing to a different theme and changing back sometimes resolved a glitch that was happening with the current preferred theme.

Source: askubuntu.com

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