Mono-INFO: DllImport attempting to load: 'libclntsh.so'.
Mono-INFO: DllImport loading location: 'libclntsh.so'.
Mono-INFO: DllImport error loading library: 'libclntsh.so: cannot open shared object file: No such file or directory'.
Mono-INFO: DllImport loading library: './libclntsh.so'.
Mono-INFO: DllImport error loading library './libclntsh.so: cannot open shared object file: No such file or directory'.
Mono-INFO: DllImport loading: 'libclntsh.so'.
Mono-INFO: DllImport error loading library 'libclntsh.so: cannot open shared object file: No such file or directory'.
Mono-INFO: DllImport attempting to load: 'libclntsh.so'.
Mono-INFO: DllImport loading location: 'libclntsh.so'.
Mono-INFO: DllImport error loading library: 'libclntsh.so: cannot open shared object file: No such file or directory'.
Mono-INFO: DllImport loading library: './libclntsh.so'.
Mono-INFO: DllImport error loading library './libclntsh.so: cannot open shared object file: No such file or directory'.
Mono-INFO: DllImport loading: 'libclntsh.so'.
Mono-INFO: DllImport error loading library 'libclntsh.so: cannot open shared object file: No such file or directory'.

(oratest.exe:22005): Mono-WARNING **: DllImport unable to load library 'libclntsh.so: cannot open shared object file: No such file or directory'.

(oratest.exe:22005): Mono-WARNING **: DllImport unable to load library 'libclntsh.so: cannot open shared object file: No such file or directory'.

Unhandled Exception: System.DllNotFoundException: libclntsh.so
in (wrapper managed-to-native) OciNativeCalls:OCIEnvCreate (intptr&,System.Data.OracleClient.Oci.OciEnvironmentMode,intptr,intptr,intptr,intptr,int,intptr)
in <0x00044> System.Data.OracleClient.Oci.OciCalls:OCIEnvCreate (System.IntPtr envhpp, OciEnvironmentMode mode, IntPtr ctxp, IntPtr malocfp, IntPtr ralocfp, IntPtr mfreep, Int32 xtramem_sz, IntPtr usrmempp)
in <0x00050> System.Data.OracleClient.Oci.OciEnvironmentHandle:.ctor (OciEnvironmentMode mode)
in <0x000b8> System.Data.OracleClient.Oci.OciGlue:CreateConnection (OracleConnectionInfo conInfo)
in <0x00046> System.Data.OracleClient.OracleConnectionPoolManager:CreateConnection (OracleConnectionInfo info)
in <0x00046> System.Data.OracleClient.OracleConnectionPool:CreateConnection ()
in <0x00151> System.Data.OracleClient.OracleConnectionPool:GetConnection ()
in <0x00155> System.Data.OracleClient.OracleConnection:Open ()
in (wrapper remoting-invoke-with-check) System.Data.OracleClient.OracleConnection:Open ()
in <0x0004a> Foo:Main ()

find /usr/lib -name "libclntsh.so"
/usr/lib/oracle/xe/app/oracle/product/10.2.0/client/lib/libclntsh.so

martinf@monodev03:~/prj/cs/oratest> ls -l /usr/lib/oracle/xe/app/oracle/product/10.2.0/client/lib/libclntsh.so
lrwxrwxrwx  1 oracle dba 17 2006-04-20 21:10 /usr/lib/oracle/xe/app/oracle/product/10.2.0/client/lib/libclntsh.so -> libclntsh.so.10.1
martinf@monodev03:~/prj/cs/oratest> ls -l /usr/lib/oracle/xe/app/oracle/product/10.2.0/client/lib/libclntsh.so.10.1
-r-xr-xr-x  1 oracle dba 14279736 2006-01-31 06:42 /usr/lib/oracle/xe/app/oracle/product/10.2.0/client/lib/libclntsh.so.10.1