I have also bought a Galaxy Tab 7 recently, and I have the same problem to recover photos to my PC. The easiest way I have found so far is to copy the photos to a memory card in the Galaxy. Then I remove the card and stick it into a card reader. Ubuntu then reads the card without a problem. I cut the photos and paste them into a suitable directory.
I have downloaded MTP, but without success so far in connecting to the Galaxy.