I've the same problem on a just installed ubuntu. I took notice that this issue arose only when my wifi router configured in a protected mode (WPA-PSK/WPA2-PSK, TKIP+AES). In an open mode wifi is OK. Hope this notice will helpful.
I've the same problem on a just installed ubuntu. I took notice that this issue arose only when my wifi router configured in a protected mode (WPA-PSK/WPA2-PSK, TKIP+AES). In an open mode wifi is OK. Hope this notice will helpful.