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無法安裝fastboot 更新 add-apt-repository

sudo apt-get install android-tools-fastboot

參考一下 From Ubuntu wiki’s instructions

Add PPAs (pre Trusty only)
The Phablet Tools PPA provides additional tools needed to install Ubuntu for devices . Tools are provided for installation on Ubuntu Desktop starting with 12.04 Precise.

You do not need to add the PPAs for Ubuntu Desktop 14.04 Trusty because the tools are available in the standard Ubuntu Universe archive component.