Originally Posted by wasabitobiko
That's the problem.. No custom recovery installed.. Still working on the driver issue.
Sent from my Nexus 4 using XDA Free mobile app
If you unlocked your bootloader your drivers should be working fine. If you rebooted your phone now you'd see it works fine. Next step in rooting is to flash custom recovery. Download a custom recovery, I recommend latest version of TWRP, then flash the recovery image. 'fastboot flash recovery recovery.img' (replace recovery.img with whatever .img file you are flashing.
Once custom recovery is installed you can boot into it to flash supersu. If using TWRP it will prompt you to root when you reboot it.