xvfb启动PyQt4程序报Unable to load library icui18n错误

xvfb启动PyQt4程序报如下错误：

Unable to load library icui18n "Cannot load library icui18n: (libicui18n.so.48: cannot open shared object file: No such file or directory)"

解决方法：

sudo apt-get install libicu48

参考：https://forums.virtualbox.org/viewtopic.php?f=7&t=49854