使用add-apt-repository时提示，could not find a distribution template for Deepin/stable

错误信息总结

zj@zj:~$ sudo add-apt-repository 'deb https://typora.io/linux ./'
Traceback (most recent call last):
  File "/usr/bin/add-apt-repository", line 95, in 
    sp = SoftwareProperties(options=options)
  File "/usr/lib/python3/dist-packages/softwareproperties/SoftwareProperties.py", line 109, in __init__
    self.reload_sourceslist()
  File "/usr/lib/python3/dist-packages/softwareproperties/SoftwareProperties.py", line 599, in reload_sourceslist
    self.distro.get_sources(self.sourceslist)    
  File "/usr/lib/python3/dist-packages/aptsources/distro.py", line 93, in get_sources
    (self.id, self.codename))
aptsources.distro.NoDistroTemplateException: Error: could not find a distribution template for Deepin/stable

解决办法：将/usr/share/python-apt/templates/Deepin.info 的 Suite: unstable 改为 Suite:stable ，重新运行上面的代码即可。

zj@zj:~$ sudo vim /usr/share/python-apt/templates/Deepin.info

打开文件后：