I had the same issue on Ubuntu 14.04 and none of proposed workarounds helped.
The way I was able to solve it was by manually restarting NetworkManager: 1) open terminal 2) type in: sudo stop network-manager 3) type in: sudo NetworkManager And that is it! Afterwards I was able to normally connect to WiFi even after restarting Ubuntu. Hope it helps and good luck! P.S. If restarting didnt help, before that I was also unsuccessfully trying to kill NetworkManager by its PID (it relaunches automatically), maybe it had some impact. I cant really reproduce the bug because it disappeared after restarting NetworkManager. -- 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/1104476 Title: Network manager cannot connect to WPA2/PEAP/MSCHAPv2 network without CA_Certificate Status in NetworkManager: Fix Released Status in Release Notes for Ubuntu: Fix Released Status in “network-manager” package in Ubuntu: Triaged Status in Gentoo Linux: Fix Released Status in “network-manager” package in openSUSE: Confirmed Bug description: === Release Notes Text === When connecting to MPA2/PEAP/MSCHAPv2 wifi networks which do not have a CA Certificate network manager may incorrectly mark the CA certificate as needing verification and fail that verification. See the bug for workarounds. === I can connect to Eduroam in 12.10 and any other previous release, but not in 13.04. I checked, my name and password are correct, all settings are the same as in 12.10. Network properties: security: WPA - WPA2 enterprise authentication: protected EAP (PEAP) CA certificate: none PEAP version: automatic inner autentication: MSCHAPv2 username: (required) password: (required) ProblemType: Bug DistroRelease: Ubuntu 13.04 Package: network-manager 0.9.6.0+git201301021750.e78c3e8-0ubuntu3 ProcVersionSignature: Ubuntu 3.8.0-1.5-generic 3.8.0-rc4 Uname: Linux 3.8.0-1-generic i686 ApportVersion: 2.8-0ubuntu2 Architecture: i386 CasperVersion: 1.330 Date: Thu Jan 24 21:32:25 2013 IfupdownConfig: # interfaces(5) file used by ifup(8) and ifdown(8) auto lo iface lo inet loopback IpRoute: default via 192.168.43.1 dev wlan0 proto static 169.254.0.0/16 dev wlan0 scope link metric 1000 192.168.43.0/24 dev wlan0 proto kernel scope link src 192.168.43.149 metric 9 LiveMediaBuild: Ubuntu 13.04 "Raring Ringtail" - Alpha i386 (20130123) MarkForUpload: True NetworkManager.state: [main] NetworkingEnabled=true WirelessEnabled=true WWANEnabled=true WimaxEnabled=true ProcEnviron: PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash SourcePackage: network-manager UpgradeStatus: No upgrade log present (probably fresh install) nmcli-con: NAME UUID TYPE TIMESTAMP TIMESTAMP-REAL AUTOCONNECT READONLY DBUS-PATH AndroidAP 978da457-563b-4c59-a894-45eb0f74fcb7 802-11-wireless 1359063171 Thu 24 Jan 2013 09:32:51 PM UTC yes no /org/freedesktop/NetworkManager/Settings/2 Wired connection 1 6703fabc-9519-49bd-a4af-45fbfb7d660e 802-3-ethernet 1359062570 Thu 24 Jan 2013 09:22:50 PM UTC yes no /org/freedesktop/NetworkManager/Settings/1 eduroam 00f69a95-4a1b-436c-b462-a284f45fbaa1 802-11-wireless 1359063171 Thu 24 Jan 2013 09:32:51 PM UTC yes no /org/freedesktop/NetworkManager/Settings/0 nmcli-dev: DEVICE TYPE STATE DBUS-PATH wlan0 802-11-wireless connected /org/freedesktop/NetworkManager/Devices/1 eth0 802-3-ethernet unavailable /org/freedesktop/NetworkManager/Devices/0 nmcli-nm: RUNNING VERSION STATE NET-ENABLED WIFI-HARDWARE WIFI WWAN-HARDWARE WWAN running 0.9.7.0 connected enabled enabled enabled enabled disabled To manage notifications about this bug go to: https://bugs.launchpad.net/network-manager/+bug/1104476/+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