[wlug] libmtp error: could not delete object.

Hi All, I have just got a 16gig micro sd card with my Granddaughters data on it. I managed to delete almost completely all the data but there are ten files that will not delete either on the phone or my computer the phone say the files are deleted but they remain the computer returns a "could not delete" error. I tried "sudo apt-get install mtp-server libmtpserver-dev" But got a error msg unable to locate mtp and libmtpserver. Any one can help please................ Cheers John..