ubuntu12.04 Wireshark:no interface can is used for capturing

http://www.dickson.me.uk/2012/09/17/installing-wireshark-on-ubuntu-12-04-lts/

Reference http://www.dickson.me.uk/2012/09/17/installing-wireshark-on-ubuntu-12-04-lts/

"No interface can be used to capturing in this system with the current configuration.".

The following steps would rectify this.

sudo usermod-a-g wireshark zhangbin sudo chgrp wireshark/usr/bin/dumpcap
sudo chmod 777/usr/bin/dumpcap
sudo setcap cap_net_raw,cap_net_admin=eip/usr/bin/dumpcap
sudo getcap/usr/bin/dumpcap

To change to 777, before is 750, otherwise there will be no permissions:

====================================================

zhangbin@ubuntu32:~$ sudo su
[sudo] Password for zhangbin: 
root@ubuntu32:/home/zhangbin# sudo apt-get install Wireshark
Reading package. .. Done
Building Dependency tree       
Reading state information ... Done
Wireshark is already the newest version.
0 upgraded, 0 newly installed, 0 to-remove and not upgraded.
root@ubuntu32:/home/zhangbin# sudo groupadd wireshark
root@ubuntu32:/home/zhangbin# sudo usermod-a-g wireshar K zhangbin
root@ubuntu32:/home/zhangbin# sudo chgrp wireshark/usr/bin/dumpcap
root@ubuntu32:/home/zhangbin# sudo chmod 750/usr/bin/dumpcap
root@ubuntu32:/home/zhangbin# sudo setcap cap_net_raw,cap_net_admin=eip/usr/bin/ Dumpcap
root@ubuntu32:/home/zhangbin# sudo getcap/usr/bin/dumpcap
/usr/bin/dumpcap = cap_net_admin,cap_net_ RAW+EIP

root@ubuntu32:/home/zhangbin#

root@ubuntu32:/home/zhangbin# sudo chmod 777/usr/bin/dumpcap