In February 2020 a bug in Chromium caused an update popup to appear. The following commands will delay displaying the update popup for 1 year (from [https://www.raspberrypi.org/forums/viewtopic.php?f=63&t=264399&sid=ff83b4376c348fb72379b97eab5be07b&start=25 Raspberrypi.org forum posting] by ShiftPlusOne.
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sudo touch /etc/chromium-browser/customizations/01-disable-update-check;echo CHROMIUM_FLAGS=\"\$\{CHROMIUM_FLAGS\} --check-for-update-interval=31536000\" | sudo tee /etc/chromium-browser/customizations/01-disable-update-check
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Note: use <code>sudo reboot</code> to restart the pi from the command line.