We have 4 Lenovo E130 laptops in our company, all running Ubuntu. One runs on Ubuntu 12.04: it had initial wifi connectivity problems but these stopped and it now connects fine (no cause identified). The others run 13.04 and have not been able to connect to WiFi unless I am directly beside the router and even then it gives only 2 out of 4 bars of signal strength. All other devices (Lenovo Desktops running Ubuntu, iMac, tablets and Smartphones, some using Windows) are able to connect fine. We upgraded one laptop to 13.10 but the connectivity problem persists: weak signal, continuously asking to re-enter the password, not connecting. It is becoming increasingly problematic for our working needs. I would be very grateful if anyone can provide assistance in terms that a simple-minded user like myself can understand and implement. Many thanks indeed!