操作系统：Ubuntu 14.04 LTS
Python：2.7.6
我安装的 Gourmet Recipe Manager 突然停止加载。当我在终端窗口中运行它时，我在回溯结束时收到以下内容：
import datetime as dt
ImportError: No module named datetime
据我所知，什么都没有改变，我的 Python 安装是最新的。它昨天停止工作了。我当然希望有一个好的方法来诊断和解决这个问题！
更新：感谢所有回复的人！
Tim，如果我问错了地方，我很抱歉。请把它当作新手，只需点击 Ubuntu 网站上的链接即可。
TheSchwa，我尝试了您的建议，但收到了与上述相同的错误消息。
muru，该软件包似乎已安装，但我不知道它是否已正确安装/配置。我该如何查明？
很抱歉问了这么多问题，但我是 RedHat 的老用户，已经远离 Linux 一段时间了。apt/dpkg 的所有东西对我来说都是新的。
答案1
14.10 更新后，我才遇到这种情况，似乎是因为我的虚拟环境有旧副本/usr/bin/python2.7（与新二进制文件不同），不包括datetime内置文件，因此在磁盘上找不到它时会出错。新解释器似乎无需任何文件 I/O 即可导入它（尝试在下面运行它strace进行检查）。
我通过激活并运行来修复每个虚拟环境：
$ cp /usr/bin/python2.7 $(which python2.7)
答案2
您可以通过以下方式重新初始化虚拟环境：
cd $VIRTUAL_ENV
virtualenv .
答案3
如果你在升级后尝试使用 letsencrypt 时遇到此问题，此解决方案对我有用letsencrypt 论坛 - 无法使用自动导入：错误：没有名为 io/2345/3 的模块
我只需要删除这个：
rm ~/.local/share/letsencrypt -R
答案4
由于我发现 14.04 中存在一些变化，因此您需要从 root 身份执行以下操作：
仅适用于日期时间：
ln -s /usr/lib/python2.7/lib-dynload/datetime.x86_64-linux-gnu.so /usr/lib/python2.7/lib-dynload/datetime.so
对于所有模块：
ln -s /usr/lib/python2.7/lib-dynload/audioop.x86_64-linux-gnu.so /usr/lib/python2.7/lib-dynload/audioop.so
ln -s /usr/lib/python2.7/lib-dynload/_bsddb.x86_64-linux-gnu.so /usr/lib/python2.7/lib-dynload/_bsddb.so
ln -s /usr/lib/python2.7/lib-dynload/bz2.x86_64-linux-gnu.so /usr/lib/python2.7/lib-dynload/bz2.so
ln -s /usr/lib/python2.7/lib-dynload/_codecs_cn.x86_64-linux-gnu.so /usr/lib/python2.7/lib-dynload/_codecs_cn.so
ln -s /usr/lib/python2.7/lib-dynload/_codecs_hk.x86_64-linux-gnu.so /usr/lib/python2.7/lib-dynload/_codecs_hk.so
ln -s /usr/lib/python2.7/lib-dynload/_codecs_iso2022.x86_64-linux-gnu.so /usr/lib/python2.7/lib-dynload/_codecs_iso2022.so
ln -s /usr/lib/python2.7/lib-dynload/_codecs_jp.x86_64-linux-gnu.so /usr/lib/python2.7/lib-dynload/_codecs_jp.so
ln -s /usr/lib/python2.7/lib-dynload/_codecs_kr.x86_64-linux-gnu.so /usr/lib/python2.7/lib-dynload/_codecs_kr.so
ln -s /usr/lib/python2.7/lib-dynload/_codecs_tw.x86_64-linux-gnu.so /usr/lib/python2.7/lib-dynload/_codecs_tw.so
ln -s /usr/lib/python2.7/lib-dynload/crypt.x86_64-linux-gnu.so /usr/lib/python2.7/lib-dynload/crypt.so
ln -s /usr/lib/python2.7/lib-dynload/_csv.x86_64-linux-gnu.so /usr/lib/python2.7/lib-dynload/_csv.so
ln -s /usr/lib/python2.7/lib-dynload/_ctypes_test.x86_64-linux-gnu.so /usr/lib/python2.7/lib-dynload/_ctypes_test.so
ln -s /usr/lib/python2.7/lib-dynload/_ctypes.x86_64-linux-gnu.so /usr/lib/python2.7/lib-dynload/_ctypes.so
ln -s /usr/lib/python2.7/lib-dynload/_curses_panel.x86_64-linux-gnu.so /usr/lib/python2.7/lib-dynload/_curses_panel.so
ln -s /usr/lib/python2.7/lib-dynload/_curses.x86_64-linux-gnu.so /usr/lib/python2.7/lib-dynload/_curses.so
ln -s /usr/lib/python2.7/lib-dynload/datetime.x86_64-linux-gnu.so /usr/lib/python2.7/lib-dynload/datetime.so
ln -s /usr/lib/python2.7/lib-dynload/dbm.x86_64-linux-gnu.so /usr/lib/python2.7/lib-dynload/dbm.so
ln -s /usr/lib/python2.7/lib-dynload/_elementtree.x86_64-linux-gnu.so /usr/lib/python2.7/lib-dynload/_elementtree.so
ln -s /usr/lib/python2.7/lib-dynload/fpectl.x86_64-linux-gnu.so /usr/lib/python2.7/lib-dynload/fpectl.so
ln -s /usr/lib/python2.7/lib-dynload/future_builtins.x86_64-linux-gnu.so /usr/lib/python2.7/lib-dynload/future_builtins.so
ln -s /usr/lib/python2.7/lib-dynload/_hashlib.x86_64-linux-gnu.so /usr/lib/python2.7/lib-dynload/_hashlib.so
ln -s /usr/lib/python2.7/lib-dynload/_hotshot.x86_64-linux-gnu.so /usr/lib/python2.7/lib-dynload/_hotshot.so
ln -s /usr/lib/python2.7/lib-dynload/_json.x86_64-linux-gnu.so /usr/lib/python2.7/lib-dynload/_json.so
ln -s /usr/lib/python2.7/lib-dynload/linuxaudiodev.x86_64-linux-gnu.so /usr/lib/python2.7/lib-dynload/linuxaudiodev.so
ln -s /usr/lib/python2.7/lib-dynload/_lsprof.x86_64-linux-gnu.so /usr/lib/python2.7/lib-dynload/_lsprof.so
ln -s /usr/lib/python2.7/lib-dynload/mmap.x86_64-linux-gnu.so /usr/lib/python2.7/lib-dynload/mmap.so
ln -s /usr/lib/python2.7/lib-dynload/_multibytecodec.x86_64-linux-gnu.so /usr/lib/python2.7/lib-dynload/_multibytecodec.so
ln -s /usr/lib/python2.7/lib-dynload/_multiprocessing.x86_64-linux-gnu.so /usr/lib/python2.7/lib-dynload/_multiprocessing.so
ln -s /usr/lib/python2.7/lib-dynload/nis.x86_64-linux-gnu.so /usr/lib/python2.7/lib-dynload/nis.so
ln -s /usr/lib/python2.7/lib-dynload/ossaudiodev.x86_64-linux-gnu.so /usr/lib/python2.7/lib-dynload/ossaudiodev.so
ln -s /usr/lib/python2.7/lib-dynload/parser.x86_64-linux-gnu.so /usr/lib/python2.7/lib-dynload/parser.so
ln -s /usr/lib/python2.7/lib-dynload/pyexpat.x86_64-linux-gnu.so /usr/lib/python2.7/lib-dynload/pyexpat.so
ln -s /usr/lib/python2.7/lib-dynload/readline.x86_64-linux-gnu.so /usr/lib/python2.7/lib-dynload/readline.so
ln -s /usr/lib/python2.7/lib-dynload/resource.x86_64-linux-gnu.so /usr/lib/python2.7/lib-dynload/resource.so
ln -s /usr/lib/python2.7/lib-dynload/_sqlite3.x86_64-linux-gnu.so /usr/lib/python2.7/lib-dynload/_sqlite3.so
ln -s /usr/lib/python2.7/lib-dynload/_ssl.x86_64-linux-gnu.so /usr/lib/python2.7/lib-dynload/_ssl.so
ln -s /usr/lib/python2.7/lib-dynload/termios.x86_64-linux-gnu.so /usr/lib/python2.7/lib-dynload/termios.so
ln -s /usr/lib/python2.7/lib-dynload/_testcapi.x86_64-linux-gnu.so /usr/lib/python2.7/lib-dynload/_testcapi.so
此外如果你使用虚拟环境复制
cp $(which python2.7) /opt/graphite/bin/python
到你的环境。