Now I fully understand the problem. Please refer to this part for others as well.

There was a problem with the power supply.

@george Thank you for your reply.

这个啥时候出啊 都这么久了 要到明年？

@mtiqbal 123

@大法师 Thank you for your reply. I will check with the information you provided.have a good day

@george
网上找的基本都是虚拟键盘 没找到什么有效的方法
这个不是虚拟键盘 只有在用触摸屏的时候才会出现
而且即使光标在文本框内 通过这个键盘也无法输入

@gbmichael28 Thanks! Which page link? we will update it.

@george thank you for the reply.As you said, we have confirmed that it is a power issue. Thank you. Have a nice day.

@jugg ls -l /media/ 查看权限，如果是root，可以试下sudo chown -R coolpi:coolpi /media/coolpi

@花月 可以设置无密码登陆的，网上搜索一下方法。

@jack_admin @大法师 现在支持HQ Camera了吗

@murraytodd 4b or cm5 evb board? could you supply some more message through uart console?

参考
https://wiki.cool-pi.com/en/home/application_notes

@dbtech You can download it from the following website:
https://coolpi-my.sharepoint.com/personal/coolpi_coolpi_onmicrosoft_com/_layouts/15/onedrive.aspx?ga=1&id=%2Fpersonal%2Fcoolpi_coolpi_onmicrosoft_com%2FDocuments%2Fcoolpi%2Fcoolpi%2FCoolPi 4B%2Fubuntu

@george said in 目前的20230613-ubuntu20.04版本预装了rknn-toolkit2、usb-hub支持吗:

@bbsvs2000 有支持

ok

@jugg 这个还是从应用软件想办法解决，底层暂时没有可以修改的。可以参考一下MPV播放器的源码实现。

@jugg 进入系统先新建一个管理员账户，重启，使用新建的管理员账户登陆，然后删除coolpi账户即可。