what happened to the Blender PPA?

ok, I’ve been having problems with this PPA ever since the second 2.75 update. Whenever I try to run blender it would give me this error:

/usr/lib/blender/blender: error while loading shared libraries: libHalf.so.11: cannot open shared object file: No such file or directory

I’ve never had this problem with anything before
how do I fix it? :c