Matplotlib pgf 後端對所有繪圖傳回“LaTeX 回傳錯誤，可能缺少字型或序言中的錯誤”

Question

過去幾個小時我一直在嘗試讓 PGF 後端正常工作。我試圖使用 xelatex，但它根本無法運行。

現在我做了這個例子：

# -*- coding: utf-8 -*-

import matplotlib as mpl
mpl.use("pgf")
pgf_with_rc_fonts = {
    "pgf.texsystem": "pdflatex"
}
mpl.rcParams.update(pgf_with_rc_fonts)

import matplotlib.pyplot as plt
plt.figure(figsize=(4.5,2.5))
plt.plot(range(5))
plt.savefig('figure.pgf')

這會引發錯誤。我稍後會講到這一點。但是，如果刪除 plt.savefig('figure.pgf')，錯誤就會消失。從終端返回的輸出是：

Traceback (most recent call last):
  File "Dokumenter/fys2130/oblig4/test.py", line 13, in <module>
    plt.savefig('figure.pgf')
  File "/home/marius/anaconda/lib/python2.7/site-packages/matplotlib/pyplot.py", line 577, in savefig
    res = fig.savefig(*args, **kwargs)
  File "/home/marius/anaconda/lib/python2.7/site-packages/matplotlib/figure.py", line 1470, in savefig
    self.canvas.print_figure(*args, **kwargs)
  File "/home/marius/anaconda/lib/python2.7/site-packages/matplotlib/backend_bases.py", line 2194, in print_figure
    **kwargs)
  File "/home/marius/anaconda/lib/python2.7/site-packages/matplotlib/backends/backend_pgf.py", line 835, in print_pgf
    self._print_pgf_to_fh(fh, *args, **kwargs)
  File "/home/marius/anaconda/lib/python2.7/site-packages/matplotlib/backends/backend_pgf.py", line 814, in _print_pgf_to_fh
    RendererPgf(self.figure, fh),
  File "/home/marius/anaconda/lib/python2.7/site-packages/matplotlib/backends/backend_pgf.py", line 422, in __init__
    self.latexManager = LatexManagerFactory.get_latex_manager()
  File "/home/marius/anaconda/lib/python2.7/site-packages/matplotlib/backends/backend_pgf.py", line 232, in get_latex_manager
    new_inst = LatexManager()
  File "/home/marius/anaconda/lib/python2.7/site-packages/matplotlib/backends/backend_pgf.py", line 322, in __init__
    raise LatexError("LaTeX returned an error, probably missing font or error in preamble:\n%s" % stdout)
matplotlib.backends.backend_pgf.LatexError: LaTeX returned an error, probably missing font or error in preamble:
This is pdfTeX, Version 3.1415926-2.4-1.40.13 (TeX Live 2012/Debian)
 restricted \write18 enabled.
**---! /home/marius/.texmf-var/web2c/pdftex/pdflatex.fmt doesn't match pdftex.pool
(Fatal format file error; I'm stymied)

我的 matplotlib 版本是 1.4.2。

我的問題是，我該如何解決這類問題？

我不知道從哪裡開始。