guido@guido-laptop:~$ apt search WhatsApp
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iwatch/xenial,xenial 0.2.2-3 all
  realtime filesystem monitoring program using inotify

python-yowsup/xenial,xenial 2.4.48-1 all
  library to implement a WhatsApp client

yowsup-cli/xenial,xenial 2.4.48-1 all
  command line tool that acts as WhatsApp client