Yes, the father of the iPhone decided to be buried in an unmarked grave at Alta Mesa Memorial Park, Palo Alto.
Credit
The reasons why he decided this seems like he never said them. I personally believe it was so that nobody would make of his tomb a place of pilgrimage. This could well happen, we all know the crazy things that can make Apple fans.
The only thing that is known is what Walter Isaacson wrote in the book "Steve Jobs" and was that the cemetery buried him near one of two apricot orchards that are on the grounds.
But the fans are the fans, when Steve died and not having a visible grave, the fans began to imagine how the tomb would look according to them. The comments flew over the Internet and even the shape of an iPod with a fatal error took the unnamed tomb of Steve Jobs into the head of one of his fans.
As a curious fact, the actress Shirley Temple is also buried in the same cemetery and also in an unmarked grave.
Credit
Article where TIL That Steve Jobs is in an unmarked grave.
Follow me 
