樹莓派4B（raspbian buster）更換源爲中科大的

1.備份源文件web sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak sudo cp /etc/apt/sources.list.d/raspi.list /etc/apt/sources.list.d/raspi.list.bak 2.編輯軟件源文件svg sudo nano /etc/apt/sources.list 將原有的註釋

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