Whenever my computer needs to restart after updating, a picture of the United Nations appears in the notification area

copy-pasting the solution from the other thread:

as root:
(1) mv /usr/share/icons/Yaru/scalable/status/un.svg /usr/share/icons/Yaru/scalable/status/un.unitednations.svg

(2) ln -s /usr/share/icons/hicolor/48x48/apps/un-reboot.png /usr/share/icons/Yaru/scalable/status/un.svg

(3) killall mate-panel

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