可能是搞坏了原先的apt源，现在用rubikpi-script安装会提示下面的错误，应该是把某个源给误删了。
E: Unable to locate package gstreamer1.0-qcom-python-examples
E: Couldn't find any package by glob 'gstreamer1.0-qcom-python-examples'
E: Package 'gstreamer1.0-qcom-sample-apps' has no installation candidate
