Thread on this in Ubuntu Mate Support & Help Requests

https://ubuntu-mate.community/t/how-to-fix-strange-un-united-nations-flag-logo-emblem-icon-issue/27449/2

It's a bug in the Yaru themes where it's looking for "un" for the Update Notifier instead of "un-reboot.png"

```code

mv /usr/share/icons/Yaru/scalable/status/un.svg /usr/share/icons/Yaru/scalable/status/un.unitednations.svg

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

killall mate-panel

```