当我尝试从 ubuntu 软件中心安装任何软件时，出现错误：
An unhandled error occured
There seems to be a programming error in aptdaemon. This is the software that allows you to install/remove software and to perform other package management related tasks.
details
Traceback (most recent call last):
File "/usr/lib/python2.7/dist-packages/aptdaemon/worker.py", line 961, in simulate
trans.unauthenticated = self._simulate_helper(trans)
File "/usr/lib/python2.7/dist-packages/aptdaemon/worker.py", line 1085, in _simulate_helper
return depends, self._cache.required_download, \
File "/usr/lib/python2.7/dist-packages/apt/cache.py", line 226, in required_download
pm.get_archives(fetcher, self._list, self._records)
SystemError: E:I wasn't able to locate file for the ttf-mscorefonts-installer package. This …