I have been fighting this problem for two months; sometimes able to work for a 
couple of days, and then it breaks again.  It occurs on multiple hardware 
platforms.  

@SDR1000:\~/SDR/uhd/host/build/examples$ sudo -E ./benchmark_rate --args 
type=b200,fpga=/usr/local/share/uhd/images/usrp_b200mini_fpga.bin --rx_rate 
10e6 --tx_rate 10e6

results in:

———————-

\[INFO\] \[UHD\] linux; GNU C++ version 9.4.0; Boost_107100; 
UHD_4.2.0.git-435-g220710b1

\[WARNING\] \[B200\] EnvironmentError: IOError: Could not find path for image: 
usrp_b200_fw.hex

Using images directory: <no images directory located>

Set the environment variable 'UHD_IMAGES_DIR' appropriately or follow the below 
instructions to download the images package.

———————

the environment variable is set in \~/.bashrc as shown below

———————

@SDR1000:\~/SDR/uhd/host/build/examples$ echo $UHD_IMAGES_DIR 

/usr/local/share/uhd/images/

jericho@SDR1000:\~/SDR/uhd/host/build/examples$ sudo -E uhd_find_devices

\[INFO\] \[UHD\] linux; GNU C++ version 9.4.0; Boost_107100; 
UHD_4.2.0.git-435-g220710b1

\--------------------------------------------------

\-- UHD Device 0

\--------------------------------------------------

Device Address:

    serial: xxxxxxxxx

    name: B200mini

    product: B200mini

    type: b200

———————

I was briefly able to have the command working benchmark_rate work last week by 
adding the args, but now it is failing again.  It fails with sudo -E or plain 
sudo.  And also fails without the args.  How do I get past this?  Thanks!
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