dpkg: dependency problems prevent removal of linux-headers-3.13.0-33:
 linux-headers-3.13.0-33-generic depends on linux-headers-3.13.0-33.

dpkg: error processing package linux-headers-3.13.0-33 (--remove):
 dependency problems - not removing
Errors were encountered while processing:
 linux-headers-3.13.0-33