本帖最后由 liuqingsheng 于 2019-11-4 12:51 编辑
我的是2G的pi4B ，直接安装19.10以及图形界面很正常。没有出现上述情况。我刚才看了UBUNTU论坛上的一些帖子，似乎都是4G内存版本的PI4B才有这个问题。树莓原生的debian9是正常的。
这是19.10 for 树莓派4G的BUG，UBUNTU 11月3日已经确定，计划修复中。
详见：
https://ubuntu.com/blog/roadmap-for-official-support-for-the-raspberry-pi-4
The Raspberry Pi 4 model B comes with different choices of RAM: 1GB, 2GB and 4GB. However, our official support for this board is currently limited to the 1GB and 2GB versions. Due to a kernel bug, USB ports are not supported out of the box in the official arm64 image on the 4GB RAM version. Kernel fixes have been identified by Canonical engineers. We are currently testing these fixes extensively. We will push updates within weeks, following successful test completion.
Raspberry Pi4型号B提供了不同的RAM选择：1GB、2GB和4GB。不过，我们对该板的官方支持目前仅限于1GB和2GB版本。由于内核错误，4gb ram版本的官方arm64映像中不支持现成的usb端口。内核修复已由规范工程师确定我们目前正在广泛测试这些修复程序在测试成功完成后，我们将在几周内推送更新。  In the meantime, developers can use a temporary workaround to enable USB on the 4GB RAM version. The temporary solution will consist in editing the file /boot/firmware/usercfg.txt to limit RAM to 3GB, as follows:
同时，开发人员可以使用临时解决方案在4GB RAM版本上启用USB。临时解决方案包括编辑文件/boot/firmware/usercfg.txt，将RAM限制为3GB，如下所示： total_mem=3072
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，不过看的不是很懂啊😱(┯_┯)
