更新管理器的编辑项里面没有软件源，程序菜单里面也找不到
不管添加什么ppa，都会出现这段文字
Traceback (most recent call last):
File "/usr/bin/add-apt-repository", line 91, in <module>
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 89, in get_sources
(self.id, self.codename))
aptsources.distro.NoDistroTemplateException: Error: could not find a distribution template for LinuxMint/rebecca
帮帮忙，谢谢

sudo gedit /etc/lsb-release
看一下是不是版本信息被改了