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I downloaded Wireshark from the Ubuntu 11.10 software center and when I start it and want to select default interface for capture in the list of interfaces are blank. I can't select default interface. Please help me.

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Try running wireshark by gksudo wireshark, you will need sudo permissions to capture packets on your network interface. – nitstorm Feb 19 '12 at 8:11
@nitstorm thanks. – geoh Feb 19 '12 at 8:23
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The answers here are more dangerous than the standard "sudo dpkg-reconfigure wireshark-common" approach, which is documented in this question: How do I run WireShark, with root-privileges? - Ask Ubuntu. This question is essentially a duplicate of that one. – nealmcb Jan 15 at 23:50

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Run wireshark with sudo priveleges - gksudo wireshark. You will need super-user permission to capture packets from your network interface.

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thank you very much – geoh Feb 19 '12 at 8:36
No problem :) Most welcome :) – nitstorm Feb 19 '12 at 8:41
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This is unnecessarily dangerous and problematic, because there are far more exploitable bugs when running the full gui as root, and configuration issues can crop up when a gui program runs as root. See the dpkg-reconfigure solution at How do I run WireShark, with root-privileges? - Ask Ubuntu for a much better option – nealmcb Jan 16 at 0:01
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I just saw that and have also voted to close this question off as a duplicate of that one. Thanks for pointing this out @nealmcb :) – nitstorm Jan 16 at 18:53
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This command string worked in my case. I don't run anything as root if I don't have to.

sudo chgrp your username /usr/bin/dumpcap
sudo chmod 750 /usr/bin/dumpcap
sudo setcap cap_net_raw,cap_net_admin+eip /usr/bin/dumpcap
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