CCS 5.3.0.00090 Debug error

Hi,

I have installed ( and reinstalled many times )CCS on my Linux ubuntu 10.04.

I can compile projects but debug send me this message :

Error initializing emulator:
Error loading libdebug.so. Please make sure that the file exists (/opt/ti/ccsv5/ccs_base/DebugServer/drivers/libdebug.so)

I dont't undesrstand because this file exist at its rigth place.

Any help would be appreciated

Regards.

Bernard