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I upgraded by desktop to Ubuntu 17.04 today and now I get this when I try to do a software update:

W: GPG error: http://deb.playonlinux.com trusty InRelease: The following signatures were invalid: 74F7358425EEB6176094C884E0F72778C4676186

I removed the repo and key:

$ sudo apt-key del C4676186

and then:

$ sudo rm /etc/apt/sources.list.d/playonlinux.list*
$ sudo apt-get clean
$ sudo apt update

However, the error persists.  How do I fix this please?

 

I have the same problem. Running the same version of Ubuntu. 

The same thing :)