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Linux Mint 19 and Yubikey

I recently upgraded Linux Mint from version 18 (18.3) to 19 (19.1). After the upgrade, my Yubikey USB device stopped working in Chrome. I was getting an "Unexpected error" message in a red box in the 2FA widget in our organization's federated login page. Originally, I thought this

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wget and robots.txt

A web application I was hired to fix was experiencing a number of unhandled exceptions. After adding error logging to capture the exceptions for review, I noticed that one of the exceptions was triggered every time a web crawler hit the site. I added a robots.txt file to the