I have the same problem, It does not matter if I use Linux or Windows. Yesterday I send and email to Wolfram support, no answer so far.
Try evaluating
PacletUpdate["HTTPClient"]
early in your session.
Not a sure cure, but this has helped with some recent communication issues.
The first thing I did was contact support, but unless you're a "Premier Service Subscriber" your options there (and likelihood of reaching a conclusion) are very limited. Was hoping that somebody else had run into the same issue.
The obvious thing to do, I would suggest, is to contact Wolfram support.
Nothing? This is a deal breaker. I can't save anything I create using Wolfram Desktop???
