Fastboot is getting stuck while trying to flash CWM onto Nexus 4 After successfully unlocking the bootloader of my new Nexus 4 using adb and fastboot I now want to install ClockworkMod Recovery onto my device.
Sadly it is not working properly. 
I am using Gnome Ubuntu 13.04 and installed adb and fastboot with apt.
While in fastboot mode my device is visible when testing with

$ sudo fastboot devices
002847af108bXXXX    fastboot


when I try to flash the ClockworkMod image recovery-clockwork-6.0.3.6-mako.img using

$ sudo fastboot flash recovery recovery-clockwork-6.0.3.6-mako.img
sending 'recovery' (7814 KB)...


it gets stuck. I already waited for 40 minutes to complete but since the size of the image is around 8Mb I suppose it cannot take that much time and something is not working correctly.
Strangely also my USB-connected keyboard and Bluetooth-connected mouse are ignoring my inputs while fastboot is running.

I also tried renaming the .img file to recovery.img with the same result.
Perhaps I am missing something obvious, but I have no idea what the problem could be.
I had the same problem and I could fix it changing the usb port, it works!