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For the past few versions (after 3.17.11), I've been unable to install this software. It can't find the plugin (which I retrieve from the website) but but also can't retrieve info from the keyserver: "Unable to recieve key from keyserver. Without this, it is not possible to authenticate and validate the plug-in prior to installation. Do you still want to install the plug-in?". After searching the internet, I found a suggested workaround: replace pgp.mit.edu by keyserver.ubuntu.com. But that didn't...