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To be able to use some vpn, i installed the xl2tpd on Ubuntu, but it did not work and i removed it. I changed a bunch of configuration files during the process. I used this tutorial: http://markusthielmann.com/blog/hotspot_shield_ubuntu

My modem configuration is set to bridging mode. So I also used pppoeconf to configure my broadband connections. And after restarting my system I can't see the connections Icon on the top bar. Wireless networks are not recognized and listed.

What can I do to identify and solve the problem?

When I right-click on the connections icon on the top and select "Edit Connections..." in the wireless tab i can see the connection but when I click the connections icon under "Wireless Networks" it says "Device Unmanaged". Previously it listed the available networks there.

The output of sudo lshw -class network is:

       description: Ethernet interface
       product: 191 Gigabit Ethernet Adapter
       vendor: Silicon Integrated Systems [SiS]
       physical id: 4
       bus info: pci@0000:00:04.0
       logical name: eth0
       version: 02
       serial: 40:61:86:18:d7:ac
       size: 100MB/s
       capacity: 100MB/s
       width: 32 bits
       clock: 33MHz
       capabilities: pm bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=sis190 driverversion=1.3 duplex=full ip= latency=0 link=yes multicast=yes port=MII speed=100MB/s
       resources: irq:19 memory:fddfcc00-fddfcc7f ioport:cc00(size=128)
       description: Wireless interface
       product: AR9285 Wireless Network Adapter (PCI-Express)
       vendor: Atheros Communications Inc.
       physical id: 0
       bus info: pci@0000:02:00.0
       logical name: wlan0
       version: 01
       serial: 1c:4b:d6:5b:1b:5e
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
       configuration: broadcast=yes driver=ath9k latency=0 multicast=yes wireless=IEEE 802.11bgn
       resources: irq:16 memory:fdff0000-fdffffff
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closed as too localized by jrg Apr 5 '12 at 21:51

This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center. If this question can be reworded to fit the rules in the help center, please edit the question.

Welcome to Ask Ubuntu! We need more hardware information to help you, can you look at this question and then edit your question adding the information? –  Jorge Castro Oct 10 '11 at 15:49
It's Ubuntu 10.04 TLs on msi EX460 laptop. It's got two network interfaces, wlan0 and eth0. What kind of log with what command should I send now? –  user26602 Oct 10 '11 at 15:51
I strongly think I messed up some configuration file, because before that I had no problem. Although I returned them back to their original status, still nothing changed. Either that vpn tutorial or pppoeconf messed something up. –  user26602 Oct 10 '11 at 16:02
This question appears to be abandoned and unanswered, could you perhaps add more detail to your question? If this question no longer applies then you can either delete it or answer it yourself if you've solved the problem. Thanks! –  Tachyons Apr 5 '12 at 21:49