Or just Google for debuggerd, Nexus 7, android 4.3 and xda; there's a thread somewhere here where someone posted a copy. It's how I fixed mine when I upgraded.
Just download it and copy it to /system/bin. Easiest if you can do it in recovery, as Chainfire used that file for some of his software hacks for either Super SU or Stickmount and unfortunately it can get copied over again on boot or reboot.
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