I have the above issue when upgrading DB2 10.5 fix pack to FP3a (currently FP3 V10.5).
The error message is as follow:
tstbwprd:/db2/db2jp1/db2_v10.5FP3a/instance # ./db2iupdt db2jp1
./db2iupdt: error while loading shared libraries: libdb2ure2.so.1: cannot open shared object file: No such file or directory
We don't have kind of issue for FP1 and FP3. either for abap and java (2 instances in 1 server)