Nsight Debugger F5 key(step into) does not work

When debugging with Nsight, the debugger does not follows the step into command(F5 key). It seems to behave like step over(F6). It used to work fine on Ubuntu 16.04. After upgrading to 18.04 it stopped working. Actually, I had this problem on two computers. I was able to fix this problem on one of them, but I have no idea how. I have now the same problem with the second computer. Can some one help us fix this problem. Thanks Ilan

Solved by reinstalling cuda