libnspr4-dbg 2:4.13.1-0ubuntu1 (arm64 binary) in ubuntu artful

 This library provides platform independent non-GUI operating system
 facilities including:
  * threads,
  * thread synchronisation,
  * normal file I/O and network I/O,
  * interval timing and calendar time,
  * basic memory management (malloc and free),
  * shared library linking.
 .
 This package provides the debugging symbols for the library.