When I flush the toilet I get bubbles the water drains slowly,sometimes the toilet overflows, I don't believe or know of an obstacle in the line, other times I flush the bubbles are few and the toilet seem fine,, I live in a home with one toilet, this problem has bee going on for about two weeks.

You have a partial blockage in the drain line, the bubbles tell you that. Bubbles are caused by the flush hitting a partial clog and bouncing back sending a bubble of sewer gas ahead of it. The drain line will have to be snaked. Good luck, Tom

Thanks for your help! We'll try that this weekend. Hopefully it will work and the problem will be solved!