Public bug reported:

$ lsb_release -rd
  Description:    Ubuntu 16.04.3 LTS
  Release:        16.04

$ apt-cache policy rednotebook
    Instalados: 2.1.4-0~201708081233~ubuntu16.04.1
    Candidato:  2.1.4-0~201708081233~ubuntu16.04.1
    Tabla de versiĆ³n:
   *** 2.1.4-0~201708081233~ubuntu16.04.1 500
          500 xenial/main 
amd64 Packages
          500 xenial/main 
i386 Packages
          100 /var/lib/dpkg/status
       1.10.1-1 500
          500 xenial/universe amd64 Packages
          500 xenial/universe i386 Packages

After the third most recent upgrade (2.1.2), Rednotebook wouldn't open
and disappeared from the Launcher.

No warning or any other clue was provided on screen as to what was the

The rednotebook.log file shows:

2017-08-08 21:13:49,275 INFO     Writing log to file 
2017-08-08 21:13:49,275 INFO     System encoding: utf-8
2017-08-08 21:13:49,276 INFO     Language code: es_NI
2017-08-08 21:13:49,448 ERROR    PyYAML not found. Please install it 

I am not aware of having uninstalled python3-yaml (how can I check?), but if I 
did, it can only have happened via 'apt autoremove' - but being a requisite for 
rednotebook it shouldn't have been included for autoremove.

If it wasn't installed beforehand, rednotebook should pass the package
name to apt for additional install.

** Affects: rednotebook (Ubuntu)
     Importance: Undecided
         Status: New

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  rednotebook wouldn't open - PyYAML not found

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