Failed to install rqt-plot

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Hi,

I am trying to install rqt-plot (I am running ROS Kinetic on Ubuntu 16.04).

When running sudo apt-get install ros-kinetic-rqt-plot I get the following error:

Err:1 http://packages.ros.org/ros/ubuntu xenial/main amd64 ros-kinetic-qt-gui-py-common amd64 0.3.11-0xenial-20180830-074357-0800 404 Not Found [IP: 140.211.166.134 80]

Err:2 http://packages.ros.org/ros/ubuntu xenial/main amd64 ros-kinetic-qwt-dependency amd64 1.1.0-0xenial-20180809-134545-0800 404 Not Found [IP: 140.211.166.134 80]

Err:3 http://packages.ros.org/ros/ubuntu xenial/main amd64 ros-kinetic-rqt-py-common amd64 0.5.0-0xenial-20190320-153730-0800 404 Not Found [IP: 140.211.166.134 80]

Err:4 http://packages.ros.org/ros/ubuntu xenial/main amd64 ros-kinetic-rqt-plot amd64 0.4.8-0xenial-20190320-171954-0800 404 Not Found [IP: 140.211.166.134 80]

E: Failed to fetch http://packages.ros.org/ros/ubuntu/po... 404 Not Found [IP: 140.211.166.134 80]

E: Failed to fetch http://packages.ros.org/ros/ubuntu/po... 404 Not Found [IP: 140.211.166.134 80]

E: Failed to fetch http://packages.ros.org/ros/ubuntu/po... 404 Not Found [IP: 140.211.166.134 80]

E: Failed to fetch http://packages.ros.org/ros/ubuntu/po... 404 Not Found [IP: 140.211.166.134 80]

E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?

I can ping packages.ros.org and 140.211.166.134 , so it doesn't seem to be a connectivity issue...

Any ideas on what's going on and how to fix it and proceed with the installation?

SOLUTION: as commented by @gvdhoorn the key has to be updated as described in #q325039.

Then run sudo apt update :

Obj:1 http://es.archive.ubuntu.com/ubuntu xenial InRelease
Obj:2 http://es.archive.ubuntu.com/ubuntu xenial-updates InRelease                                                                                                                  
Obj:3 http://es.archive.ubuntu.com/ubuntu xenial-backports InRelease                                                                                                                
Ign:4 http://dl.google.com/linux/chrome/deb stable InRelease                                                                                                               
Des:5 http://security.ubuntu.com/ubuntu xenial-security InRelease [109 kB]                                                                             
Obj:6 http://dl.google.com/linux/chrome/deb stable Release                                                      
Des:7 http://packages.ros.org/ros/ubuntu xenial InRelease [4.678 B]                                             
Des:9 http://packages.ros.org/ros/ubuntu xenial/main amd64 Packages [785 kB]                   
Des:10 https://packagecloud.io/AtomEditor/atom/any any InRelease [23,2 kB]
Ign:10 https://packagecloud.io/AtomEditor/atom/any any InRelease                      
Des:11 http://packages.ros.org/ros/ubuntu xenial/main i386 Packages [561 kB]
Descargados 1.483 kB en 3s (396 kB/s)
Leyendo lista de paquetes... Hecho