[问题]latex 错误 “I can't find the format file `latex.fmt'!”

[flysohigh]

san@ubuntu:~/test$ latex latextest.tex
This is pdfTeXk, Version 3.141592-1.40.3 (Web2C 7.5.6)
%&-line parsing enabled.
kpathsea: Running mktexfmt latex.fmt
fmtutil: config file `fmtutil.cnf' not found.
I can't find the format file `latex.fmt'!

[flysohigh]

san@ubuntu:~/test$ latex latextest.tex
This is pdfTeXk, Version 3.141592-1.40.3 (Web2C 7.5.6)
%&-line parsing enabled.
kpathsea: Running mktexfmt latex.fmt
fmtutil: config file `fmtutil.cnf' not found.
I can't find the format file `latex.fmt'!

我用 locate 可以找到那个文件的，

代码： 全选

san@ubuntu:~/test$ locate latex.fmt
/var/lib/texmf/web2c/pdftex/latex.fmt
/var/lib/texmf/web2c/pdftex/pdflatex.fmt

要是用

代码： 全选

su - 

也可以，只是找不到字体
我猜是环境变量不对，但是不知道是哪儿不对，以前还是好的！