\begin{tikzpicture}
\tikzstyle{every node}=[draw,shape=circle];
\node (v3) at (4, 0) {$v_3$};
\node (v5) at (2, -2) {$v_5$};
\draw [->] (v3)--(v5);
\end{tikzpicture}
上面的代码给了我：
沒有箭頭的地方。
但是如果你改变的坐标(v5)，比如(3,-1.5)，那么我将得到：
在节点处出现一个非常小的箭头(v5)。
我是不是漏掉了什么？谢谢
编辑：正如@Cmhughes所建议的，
ubuntu 13.04我从官方仓库安装了 texlive 。并且
\listfiles输出：
*File List*
nag.sty 2011/11/25 0.7 warning about old commands (ulmi)
nag-l2tabu.cfg 2010/05/17 v2.11 l2tabu rules for nag.sty (ulmi)
nag-orthodox.cfg 2006/04/19 v1.8 strict rules for nag.sty (ulmi)
article.cls 2007/10/19 v1.4h Standard LaTeX document class
size10.clo 2007/10/19 v1.4h Standard LaTeX file (size option)
tikz.sty 2010/10/13 v2.10 (rcs-revision 1.76)
pgf.sty 2008/01/15 v2.10 (rcs-revision 1.12)
pgfrcs.sty 2010/10/25 v2.10 (rcs-revision 1.24)
everyshi.sty 2001/05/15 v3.00 EveryShipout Package (MS)
pgfrcs.code.tex
pgfcore.sty 2010/04/11 v2.10 (rcs-revision 1.7)
graphicx.sty 1999/02/16 v1.0f Enhanced LaTeX Graphics (DPC,SPQR)
keyval.sty 1999/03/16 v1.13 key=value parser (DPC)
graphics.sty 2009/02/05 v1.0o Standard LaTeX Graphics (DPC,SPQR)
trig.sty 1999/03/16 v1.09 sin cos tan (DPC)
graphics.cfg 2010/04/23 v1.9 graphics configuration of TeX Live
pdftex.def 2011/05/27 v0.06d Graphics/color for pdfTeX
infwarerr.sty 2010/04/08 v1.3 Providing info/warning/error messages (HO)
ltxcmds.sty 2011/11/09 v1.22 LaTeX kernel commands for general use (HO)
pgfsys.sty 2010/06/30 v2.10 (rcs-revision 1.37)
pgfsys.code.tex
pgfsyssoftpath.code.tex 2008/07/18 (rcs-revision 1.7)
pgfsysprotocol.code.tex 2006/10/16 (rcs-revision 1.4)
xcolor.sty 2007/01/21 v2.11 LaTeX color extensions (UK)
color.cfg 2007/01/18 v1.5 color configuration of teTeX/TeXLive
pgfcore.code.tex
pgfcomp-version-0-65.sty 2007/07/03 v2.10 (rcs-revision 1.7)
pgfcomp-version-1-18.sty 2007/07/23 v2.10 (rcs-revision 1.1)
pgffor.sty 2010/03/23 v2.10 (rcs-revision 1.18)
pgfkeys.sty
pgfkeys.code.tex
pgffor.code.tex
tikz.code.tex
url.sty 2006/04/12 ver 3.3 Verb mode for urls, etc.
hyperref.sty 2012/05/13 v6.82q Hypertext links for LaTeX
hobsub-hyperref.sty 2012/05/28 v1.13 Bundle oberdiek, subset hyperref (HO)
hobsub-generic.sty 2012/05/28 v1.13 Bundle oberdiek, subset generic (HO)
hobsub.sty 2012/05/28 v1.13 Construct package bundles (HO)
ifluatex.sty 2010/03/01 v1.3 Provides the ifluatex switch (HO)
ifvtex.sty 2010/03/01 v1.5 Detect VTeX and its facilities (HO)
intcalc.sty 2007/09/27 v1.1 Expandable calculations with integers (HO)
ifpdf.sty 2011/01/30 v2.3 Provides the ifpdf switch (HO)
etexcmds.sty 2011/02/16 v1.5 Avoid name clashes with e-TeX commands (HO)
kvsetkeys.sty 2012/04/25 v1.16 Key value parser (HO)
kvdefinekeys.sty 2011/04/07 v1.3 Define keys (HO)
pdftexcmds.sty 2011/11/29 v0.20 Utility functions of pdfTeX for LuaTeX (HO)
pdfescape.sty 2011/11/25 v1.13 Implements pdfTeX's escape features (HO)
bigintcalc.sty 2012/04/08 v1.3 Expandable calculations on big integers (HO)
bitset.sty 2011/01/30 v1.1 Handle bit-vector datatype (HO)
uniquecounter.sty 2011/01/30 v1.2 Provide unlimited unique counter (HO)
letltxmacro.sty 2010/09/02 v1.4 Let assignment for LaTeX macros (HO)
hopatch.sty 2012/05/28 v1.2 Wrapper for package hooks (HO)
xcolor-patch.sty 2011/01/30 xcolor patch
atveryend.sty 2011/06/30 v1.8 Hooks at the very end of document (HO)
atbegshi.sty 2011/10/05 v1.16 At begin shipout hook (HO)
refcount.sty 2011/10/16 v3.4 Data extraction from label references (HO)
hycolor.sty 2011/01/30 v1.7 Color options for hyperref/bookmark (HO)
ifxetex.sty 2010/09/12 v0.6 Provides ifxetex conditional
kvoptions.sty 2011/06/30 v3.11 Key value format for package options (HO)
pd1enc.def 2012/05/13 v6.82q Hyperref: PDFDocEncoding definition (HO)
hyperref.cfg 2002/06/06 v1.2 hyperref configuration of TeXLive
hpdftex.def 2012/05/13 v6.82q Hyperref driver for pdfTeX
rerunfilecheck.sty 2011/04/15 v1.7 Rerun checks for auxiliary files (HO)
supp-pdf.mkii
epstopdf-base.sty 2010/02/09 v2.5 Base part for package epstopdf
grfext.sty 2010/08/19 v1.1 Manage graphics extensions (HO)
epstopdf-sys.cfg 2010/07/13 v1.3 Configuration of (r)epstopdf for TeX Live
nameref.sty 2010/04/30 v2.40 Cross-referencing by name of section
gettitlestring.sty 2010/12/03 v1.4 Cleanup title references (HO)