try this: "sudo aptitude purge evince" then check to see if /usr/lib/evince/1/backends/libpdfdocument.so is still there. if it is, remove it then install evince again...
try this: "sudo aptitude purge evince" evince/ 1/backends/ libpdfdocument. so is still there. if it is, remove it
then check to see if /usr/lib/
then install evince again...