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I just did a reinstall of Ubuntu 12.04 because I messed up trying to fix graphics card issues. Now, whenever I try to connect to my wifi, it tries to connect for several minutes and then asks me for the password again.

Here is my relevant output for lspci:

07:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 06)
0d:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8188CE 802.11b/g/n WiFi Adapter (rev 01)
13:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS5209 PCI Express Card Reader (rev 01)
13:00.1 SD Host controller: Realtek Semiconductor Co., Ltd. RTS5209 PCI Express Card Reader (rev 01)

and sudo lshw -C network:

*-network
       description: Wireless interface
       product: RTL8188CE 802.11b/g/n WiFi Adapter
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0
       bus info: pci@0000:0d:00.0
       logical name: wlan0
       version: 01
       serial: 20:10:7a:6c:c8:35
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
       configuration: broadcast=yes driver=rtl8192ce driverversion=3.11.0-18-generic firmware=N/A ip=192.168.0.13 latency=0 link=yes multicast=yes wireless=IEEE 802.11bgn
       resources: irq:17 ioport:3000(size=256) memory:c4500000-c4503fff
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Have you a laptop or a PC? Try Additional Drivers, open it like this: Settings>Additional Drivers. Now search for your realtek driver and install it. If you still face problems you can buy a new network card. Another soulution is to check your own network connectivity and your network router configuration. To enter this type 192.168.1.1 in your browser or your router gateway or reset your router and set it up again. This problem caused with me too! –  user262811 Mar 28 at 4:18

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