I have a Toshiba Satellite with Realtek 8723e 802.11n and running Ubuntu 12.04. I have installed the driver and all was well until this happened. It shows my network, but when I try to connect, it sort of keeps looping back to authenticate. I know my password is correct, and it isn't a problem with the network itself as it easily connects with other devices. Is it a problem with the driver? Some times it just miraculously connects. I have tried digging the forums but to no avail.
$ lshw -C network WARNING: you should run this program as super-user. *-network description: Ethernet interface product: AR8162 Fast Ethernet vendor: Atheros Communications Inc. physical id: 0 bus info: pci@0000:01:00.0 logical name: eth0 version: 10 serial: 00:26:6c:28:ae:c8 size: 100Mbit/s capacity: 100Mbit/s width: 64 bits clock: 33MHz capabilities: bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd autonegotiation configuration: autonegotiation=on broadcast=yes driver=alx duplex=full firmware=alx ip=192.168.1.15 latency=0 multicast=yes port=twisted pair speed=100Mbit/s resources: irq:42 memory:88500000-8853ffff ioport:3000(size=128) *-network description: Wireless interface product: Realtek Semiconductor Co., Ltd. vendor: Realtek Semiconductor Co., Ltd. physical id: 0 bus info: pci@0000:02:00.0 logical name: wlan0 version: 00 serial: 74:e5:43:bc:49:a3 width: 64 bits clock: 33MHz capabilities: bus_master cap_list ethernet physical wireless configuration: broadcast=yes driver=rtl8723e driverversion=3.2.0-38-generic-pae firmware=N/A latency=0 multicast=yes wireless=IEEE 802.11bgn resources: irq:17 ioport:2000(size=256) memory:88400000-88403fff WARNING: output may be incomplete or inaccurate, you should run this program as super- user.