为什么我的ADvaced Setting里面里面的shell扩展是空白的

发生了一个无法处理的错误
aptdaemon 中似乎有编程错误，该软件用于安装、卸载软件并且执行其他的软件包管理任务。
Traceback (most recent call last):
File "/usr/lib/python2.7/dist-packages/aptdaemon/worker.py", line 968, in simulate
trans.unauthenticated = self._simulate_helper(trans)
File "/usr/lib/python2.7/dist-packages/aptdaemon/worker.py", line 1092, in _simulate_helper
return depends, self._cache.required_download, \
File "/usr/lib/python2.7/dist-packages/apt/cache.py", line 235, in required_download
pm.get_archives(fetcher, self._list, self._records)
SystemError: E:I wasn't able to locate a file for the ttf-mscorefonts-installer package. This might mean you need to manually fix this package.


求解决方法。

已经说明了