There had been limited chances for either side before Swindon hit the bar on 40 minutes with a shot from Ady Williams, but Notts County cleared the ball away to safety.
Swindon took the lead just after half time on 47 minutes when Onibuje scored his first goal for the club after taking the ball around the 'keeper to score into the empty net.
Swindon came close to getting a second goal, but it was Notts County who scored on 65 minutes after a corner Alan White headed the ball into the net.
With 15 minutes left Lee Peacock hit the bar, and the ball bounced down, but no goal was given, and Notts County cleared the ball away.
Christian Roberts came on to replace Fola Onibuje, and Andy Monkhouse replaced Aaron Brown,
Both sides ran out of time and the game finished 1-1 which overall was a fair result. Swindon's next game is the localish derby away to wycombe on Tuesday evening.