czhang@usrp-pc:~$ uhd_find_devices 
\linux; GNU C++ version 4.7.2; Boost_104900; UHD_003.005.004-157-unstable

--------------------------------------------------
-- UHD Device 0
--------------------------------------------------
Device Address:
    type: b200
    name: 
    serial: EAR04ZEBT


czhang@usrp-pc:~$ sudo uhd_usrp_probe
linux; GNU C++ version 4.7.2; Boost_104900; UHD_003.005.004-157-unstable

-- Loading FPGA image: /usr/share/uhd/images/usrp_b210_fpga.bin...100% Operating over USB 51.
Error: AssertionError: libusb_claim_interface(this->get(), interface) == 0
  in virtual void libusb_device_handle_impl::claim_interface(int)
  at /root/remote_fs_root/workspace/bf4_ubuntu-build/Slaves/Ubuntu-12.10-x86_64/uhd/host/lib/transport/libusb1_base.cpp:203