deb http://free.nchc.org.tw/raspbian/raspbian stretch main contrib non-free rpi #Free Software Lab, NCHCdeb http://mirror.ossplanet.net/raspbian/raspbian/ stretch main contrib non-free rpi #Ubuntu-TW Local Team + OSS Planetdeb http://ftp.yzu.edu.tw/Linux/raspbian/raspbian stretch main contrib non-free rpi #Yuan-Ze University