Como eu encontrei algumas mudanças em 14.04, você precisa fazer isso a partir do root:
Somente para datetime:
ln -s /usr/lib/python2.7/lib-dynload/datetime.x86_64-linux-gnu.so /usr/lib/python2.7/lib-dynload/datetime.so
Para todos os módulos:
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
Além disso, se você usar a cópia de env virtual
cp $(which python2.7) /opt/graphite/bin/python
para o seu env.