This topic is about upload problems with an Uno; are you indeed using an Uno (based on the output that you provided it can be)?
- Anything connected to pins 0 and 1? Disconnect it and retry.
- If (1) did not solve it or is not applicable, disconnect other things that are connected.
- If your board is an original Arduino Uno/Nano (and not a clone with CH340), did you try the Loop-Back Test Instructions? What was the result?
- What is the history of the board?
- Did it ever work?
- If yes, what are the previous project and current project that you were / are working before it started failing?
- What happens when you press and release the reset button? Does the L-LED give a couple of quick flashes after releasing (see post #2)?