Now of ADB/Fastboot can be downloaded separately. Unfortunately I wasn't able to run it out-of-the-box on Ubuntu 14.04 AMD64, and I get fastboot: usage :no command while trying to run it.
Running fastboot as usual goes like this:
fastboot is not installed, install it from android-tools-fastboot
Running from current directory as
fastboot: usage :no command
Adding fastboot dir to PATH via .bashrc like this
gives the same error as the former.
What is wrong?