Default OS update log

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That icon is mostly updating the kernel, uboot and device tree. You should update the actual Debian system from time to time via

# apt-get update && apt-get dist-upgrade

I would recomend:

# apt update && apt upgrade

instead. It's slightly shorter and nicer for interactive use. Besides, 'apt upgrade' should be sufficient for the same release.

'apt full-upgrade' or 'apt-get dist-upgrade' are only needed when upgrading to the next release or if you are running Debian's testing or unstable versions.

You might also want to run 'apt autoremove' (or 'apt --purge autoremove' if you understand the difference between 'remove' and 'purge') when suggested by apt.