I've found a workaround to make the wifi connection work. My wifi hotspot has an option that make the best channel chosen to establish the connection (the one with less interferences).
In Gusty the wifi connection is made without any problems when this option is activated. But in Hardy it seems to be an issue. When I disable this option the wifi connection can be activated. There is another point, now my wifi signal is very low (35%) whereas in Gusty with the same parameters and the same positionning of the computer and the hotspot, the signal is about 83%. -- [hardy]Network controller: RaLink RT2600 802.11 MIMO don't work with network-manager https://bugs.launchpad.net/bugs/221970 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs