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问题背景：树莓派4B armv7l架构，安装Ubuntu20.04 32位系统 + 桌面 使用一键安装ROS时，在更换ROS源时出问题，多次更换源失败
4B
armv7l
32
@zwt190315 可能因为32位系统原因
@小鱼 这个型号的树莓派4B可以装32/64位的Ubuntu，那我最好是不是换成64位Ubuntu再试试同样的安装？
32/64
64
@zwt190315 对的，换成64位的尝试
