当我运行时sudo apt-get upgrade，出现 dpkg 错误并中断进程。
错误详情：
Setting up python-minimal (2.7.3-0ubuntu7.1) ...
Traceback (most recent call last):
File "/usr/local/lib/python2.7/runpy.py", line 162, in _run_module_as_main
"__main__", fname, loader, pkg_name)
File "/usr/local/lib/python2.7/runpy.py", line 72, in _run_code
exec code in run_globals
File "/usr/local/lib/python2.7/compileall.py", line 16, in <module>
import struct
File "/usr/local/lib/python2.7/struct.py", line 1, in <module>
from _struct import *
ImportError: No module named _struct
dpkg: error processing python-minimal (--configure):
subprocess installed post-installation script returned error exit status 255
dpkg: dependency problems prevent configuration …dpkg ×1