树莓派Lite Kiosk环境下Onboard虚拟键盘无法显示问题求助

配置背景与操作步骤 #

• 基于树莓派搭建替代Google Nest Hub Max的Kiosk环境
• 执行命令sudo apt-get install onboard安装Onboard虚拟键盘
• 在/etc/xdg/openbox/autostart中添加onboard &设置开机自启

问题现象 #

• 首次开机时虚拟键盘正常显示，开启自动隐藏功能后重启，键盘按预期隐藏
• 重启后无论如何操作都无法调出键盘
• 通过SSH执行onboard -display :0手动启动时，触发以下报错：

Traceback (most recent call last):
  File "/usr/bin/onboard", line 35, in <module>
    from Onboard.OnboardGtk import OnboardGtk as Onboard
  File "/usr/lib/python3/dist-packages/Onboard/OnboardGtk.py", line 47, in <module>
    from Onboard.KbdWindow import KbdWindow, KbdPlugWindow
  File "/usr/lib/python3/dist-packages/Onboard/KbdWindow.py", line 48, in <module>
    config = Config()
  File "/usr/lib/python3/dist-packages/Onboard/Config.py", line 214, in __new__
    cls.self.construct()
  File "/usr/lib/python3/dist-packages/Onboard/Config.py", line 315, in construct
    self._init_logging(min_level_name, max_level_name)
  File "/usr/lib/python3/dist-packages/Onboard/Config.py", line 599, in _init_logging
    root.setLevel(min_level_name.upper())
  File "/usr/lib/python3.9/logging/__init__.py", line 1417, in setLevel
    self.level = _checkLevel(level)
  File "/usr/lib/python3.9/logging/__init__.py", line 194, in _checkLevel
    raise ValueError("Unknown level: %r" % level)
ValueError: Unknown level: 'ISPLAY'

• 已在Launchpad提交问题，但该应用最后更新于2017-10-09，仅收到无关回复

内容的提问来源于stack exchange，提问作者Eksistenze