Since WiFi icon disappear on wingpanel I'm unable to connect to the new WiFi networks. the connect button on the Network settings also not working, can anyone tell me how to fix the network icon or are there any way to connect to new WiFi networks? Thank you.
This generally happens when the appindicator library fails to load.
Try restarting the wingpanel by
If that doesn't work, try checking if you have
indicator-application installed or not.
If you already have them installed, try reinstalling
libappindicator and then log out an back in.
sudo apt-get install --reinstall libappindicator3-1 libappindicator1
You should also check this: Bug: No WIFI Icon Up In The Right Corner
Fixed after re-installing the network manager
sudo apt-get install --reinstall network-manager network-manager-gnome