Usrp error

My problem is that my usrp is not recognized by the gnuradio. When I try
to proble the usrp I get the following error.

usrp: failed to find usrp[0]

when I tried to use the usrper command to load firmware manually to the
fpga I got a message to install usrp. Then when i install the usrp I get
the following,

david@david-laptop:/usr/share/usrp/rev4$ sudo apt-get install usrp
[sudo] password for david:
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 resolve the situation:

The following packages have unmet dependencies:
usrp: Depends: python-usrp (= 3.0.4-2ubuntu3) but 3.2.2-1 is to be
installed
Recommends: usrp-firmware but it is not going to be installed
E: Broken packages

Please help…!!!

David