Christian: Sounds like maybe it could be a problem with network-manager + lightdm, as gnome use GDM it makes sense there is no issue there.
In the meantime, you could always use this script: http://askubuntu.com/questions/761180/wifi-doesnt-work-after-suspend- after-16-04-upgrade/761220#761220 -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to network-manager in Ubuntu. https://bugs.launchpad.net/bugs/1589401 Title: cannot view wifi networks after re-enabling wifi Status in NetworkManager: Confirmed Status in network-manager package in Ubuntu: Incomplete Bug description: after re enabling wifi, up-down arrows just like wired network. cannot see any wifi ssid. To manage notifications about this bug go to: https://bugs.launchpad.net/network-manager/+bug/1589401/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp