大佬们有没有遇到过，单击"Software & Updates"没有响应的问题？

[nbuntu]

请教一下，单击app "Software & Updates"，app没有响应是什么原因。

下面是使用software-properties-gtk命令，查看报错。不知道和不响应的问题是不是相关的。
nbuntu@ubuntu:~$ software-properties-gtk
Traceback (most recent call last):
File "/usr/bin/software-properties-gtk", line 100, in <module>
app = SoftwarePropertiesGtk(datadir=options.data_dir, options=options, file=file)
File "/usr/lib/python3/dist-packages/softwareproperties/gtk/SoftwarePropertiesGtk.py", line 209, in __init__
self.init_ubuntu_pro()
File "/usr/lib/python3/dist-packages/softwareproperties/gtk/SoftwarePropertiesGtk.py", line 1547, in init_ubuntu_pro
self.ubuntu_pro_page = UbuntuProPage(self)
File "/usr/lib/python3/dist-packages/softwareproperties/gtk/UbuntuProPage.py", line 97, in __init__
if distro.eol_esm is not None:
AttributeError: 'DistroRelease' object has no attribute 'eol_esm'

系统版本：Ubuntu 18.04.6 LTS
虚拟机：Vmware16