ubuntu软件中心安装软件报错。

错误信息为：aptdaemon 允许您添加或删除软件，并可执行其他与包管理有关的工作。请报告此错误到 http://launchpad.net/aptdaemon/+filebug 并重试。
详细信息：Traceback (most recent call last):
  File "/usr/lib/python2.6/dist-packages/aptdaemon/worker.py", line 768, in simulate
  return self._simulate_helper(trans, status_path)
  File "/usr/lib/python2.6/dist-packages/aptdaemon/worker.py", line 938, in _simulate_helper
  return depends, status, self._cache.required_download, \
  File "/usr/lib/python2.6/dist-packages/apt/cache.py", line 218, 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 might mean you need to manually fix this package.


在网上找了一大堆，有的说源有问题，替换源，有的说去新立得升级aptdaemon包，
到底什么原因呢，有人遇到没有？

ubuntu软件中心
还不成熟，占用资源很多，bug也有