Linux: New UNO not blinking led

I just got a UNO and I am trying to develop under Linux. I load and build Blink sketch from examples and it doesn't blink, LED just stays on. I use a Windows systems and it blinks. I tried setting delay(1), and checked with an oscilloscope for a changing pin 13, but it stayed high.

Enabled both compile and upload watching and it does builds and uploads ok.

Why doesn't Linux blink the LED?

tj

Follow up, built sketch DigitalReadSerial and it works.

Why doesn't Blink work?

tj