The required library file libstdc++.so.5 is not found on the system.

ERROR: 

   The required library file libstdc++.so.5 is not found on the system. 

   Check the following web site for the up-to-date system requirements

   of IBM DB2 9.5

   http://www.ibm.com/software/data/db2/udb/sysreqs.html

   http://www.software.ibm.com/data/db2/linux/validate 

将libstdc++.so.5放入/usr/lib下即可