I just tried a search with Synapse and cannot replicate your problem, it works fine here!. I found how to edit the settings but there isn't a lot you can do with it! (once you start Synapse the symbol will show in the top panel, right click > Preferences).
As you seem to be having multiple problems (I am assuming this because of your many different threads on the forum!), I must ask you how you created your bootable media and did you follow this advice?:
What (if any) graphics card driver do you have installed?:
Try changing your software sources download location and run a fresh system update:
