我在让 web-greeter 为 lightdm 工作时遇到了问题。启动时屏幕变黑，当我运行 webgreeter 测试时，我得到了以下输出：
2021-03-01 12:25:09 [ DEBUG ] objects - objects.py:124 : _setup_logger | Logger is ready.
2021-03-01 12:25:09 [ DEBUG ] app - app.py:57 : _wh_load_config | Try load config using key: WebGreeter
2021-03-01 12:25:09 [ DEBUG ] window - window.py:78 : _initialize | Initializing
Main Window Received signal 11 SEGV_MAPERR 000000000000
#0 0x7f85d5fe89a5 <unknown>
#1 0x7f85d4d28501 <unknown>
#2 0x7f85d5fe8d3d <unknown>
#3 0x7f85e3062bb0 <unknown> r8: 0000000000000001 r9: 00000000024a62a0
r10: 0000000000000002 r11: 00007f85dfedc000 r12: 00000000026849e0
r13: 0000000002493550 r14: 0000000000000000 r15: 00007f85dffcd280
di: 0000000000001f01 si: 00007f85dffcf210 bp: 00000000024aff40
bx: 0000000000000001 dx: 00000000024410b0 ax: 00000000024410b0
cx: 0000000000000000 sp: 00007ffd9dd09728 ip: 0000000000000000
efl: 0000000000010206 cgf: 002b000000000033 erf: 0000000000000014
trp: 000000000000000e msk: 0000000000000000 cr2: 0000000000000000
[end of stack trace] Calling _exit(1). Core file will not be generated.
有人知道上面的错误是什么或是什么原因造成的吗？我重新安装了所有依赖项，但仍然得到相同的输出。