i tried to install wireshark on ubuntu 12.04 but when i enter the cod the message is whone to me is

iqbal@iqbal-HP-ProBook-4530s:~$ sudo apt-get install wireshark Reading package lists... Done Building dependency tree
Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation:

The following packages have unmet dependencies: wireshark : Depends: wireshark-common (= 1.11.4+svn20140420104827~d0489f2a-0ubuntu1~precise1~ppa0) but it is not going to be installed

E: Unable to correct problems, you have held broken packages

so how can i install wireshark on ubuntu 12.04 if any one can please tell me thanks