"Failed to install important system update error"

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12

This is normally related to a firmware upgrade. The firmware upgrade is OK but the error gets reported anyway.

If you search for a file containing the text <UID> in /var using grep, for example:
sudo grep -rnw /var/ -e '570d24e21cec6aadc4c7019ea2d7cfc16c22191b'

you will more than likely find /var/lib/fwupd/pending.db. Deleted this file and restart. The message will then be gone.

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