DROID 4 ADB Driver for Linux I'm trying to unlock my phone using this tutorial.
It stated that:

Prerequisites


A computer with DROID 4 adb drivers installed. alternate link
Enable USB Debugging on your device by going to Developers options. 
Download RAZR BLADE exploit by djrbliss from here.


But there are no Linux driver, or is it not needed for Linux?

Why I need this?
because I need to remove /system/app/VZWPhoneService.apk and /system/app/VZWPhoneService.odex. then reboot., because the other way already expired. So I could use this phone using another carrier.

The alternate method also requires Windows OS.
Assuming your device is rooted there is a ppa for adb and fastboot. 

Type:

sudo add-apt-repository ppa:nilarimogardwebupd8

sudo apt-get update

sudo apt-get install android-tools-adb android-tools-fastboot


Now you should open a shell/rootshell and type

adb


followed by

adb devices


Then your Phone should show up. To delete the app and odex file type:

adb rm /path/to/apk

adb rm /path/to/file


or

adb uninstall [-k] packagename


The option -k keeps cache and data on your phone if you want to.

Then end this process by using 

adb reboot


Cheers