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I have Xubuntu 16.04 and when i try to use the connect to hidden WIFI network I can choose the network i prepared before but the button connect is always dimmed
the user i use is member in these groups
$ groups
root adm dialout fax cdrom floppy tape sudo audio dip video plugdev netdev lpadmin scanner sambashare vboxusers
so how i can solve this issue
It appears to be a bug: https://bugs.launchpad.net/ubuntu/+source/network-manager-applet/+bug/1542733
The workaround is to use a terminal like
nmcli c up id "SSID"
where you replace SSID by the name of your hidden Wifi.
Practically, using a hidden SSID is not helpful anymore. It was really helpful back in the days of Windows XP or earlier when hidden networks were not showing anywhere unless one used specific third party software for revealing them.
Now, as you can see, it's just one more click and they're there. It's better to unhide your network SSID, maximize your protection settings using WPA2/AES-256 exclusively and using a 20 or 32 character strong passphrase.
This way, you will use the maximum protection current wireless encryption technology can offer.
