After 4 days i found the best way to solve it & upgrade my OS is to download the latest snapshot form the official website : .
The problem will remain a mystery maybe i was a bit unlucky with the snapshot i installed while ago. it has some other strange problems like Kvantum theme is installed but appears corrupted. or the screen which is flickering even after trying many solutions from other Linux forums. The update to the snapshot 20211215 solved all the problems i was having.Based on your installed packages you will need around 5 G Byte free space to do the update.