Ubuntu 八度->gnuplot错误：缺少共享库

最近，我将y倍频程升级到3.6.2，但现在我无法用[c，h]=contourfx，y，z[0:0.25:3]绘制轮廓。以下错误表明gnuplot无法加载名为libreadline.so.4的共享库

此文件在我的/var/lib/目录中不存在。您知道如何解决此问题吗：

error: get: unknown axes property 
error: called from:
error:   /usr/share/octave/3.6.2/m/plot/colorbar.m at line 139, column 9
error:   /green/s61/mirjalil/MemPMF/acem-acem/forward/loadDataPMF.m at line 24, column 1
gnuplot: error while loading shared libraries: libreadline.so.4: cannot open shared object file: No such file or directory
gnuplot: error while loading shared libraries: libreadline.so.4: cannot open shared object file: No such file or directory
warning: broken pipe -- some output may be lost

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您是如何安装/升级Octave的？你是在Windows机器上，从二进制文件安装，还是在Mac上使用fink或macports之类的软件？我使用的是Ubuntu12.04，之前用“sudo apt get…”升级过octave