People, need help. I'm in the middle of a hectic work day and the system fonts just went haywire (try to read the browser's tab names)

[![haywire fonts](https://i.stack.imgur.com/JPJsP.jpg)](https://i.stack.imgur.com/JPJsP.jpg)

There was no system update. I was using the browser and something like a white-flash happened. And, then I noticed nothing outside an application was readable. But everything rendered within an app was - like - text within Sublime Text, Chrome was all readable. 

Things tried - 
1. `fc-cache -f -v` , followed by system reboot.
2. Followed through all the steps here hoping it was a font selection issue - [fix default fonts](https://www.google.com/url?q=https%3A%2F%2Fseasonofcode.com%2Fposts%2Fhow-to-set-default-fonts-and-font-aliases-on-linux.html&sa=D&sntz=1&usg=AFQjCNGCK6sqN2TFVihJgZi7j1HCTT1gtQ)

I figure it probably was a font malfunction which I didn't have time to debug, so I switched to Ubuntu.
Leaving the question here for future users.