@crimsonzombie said in "Resized root filesystem. Rebooting in 5 seconds...":
Has anyone ever come across this message? What does it mean and is this a problem?
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As @sleve_mcdichael mentioned, it's not a problem and it's normal, that is a task that runs on the first boot of the system. The same process happens when using the official RaspiOS images from the Raspberry Pi - in fact this is unchanged from the upstream RaspiOS images, upon which the RetroPie image is based on.