adwaita-icon-theme dropped support for legacy icons, these were a set of symlinks generated from the mapping in: /usr/share/icon-naming-utils/legacy-icon-mapping.xml
So probably ubiquity is using one of these legacy icon names
adwaita-icon-theme dropped support for legacy icons, these were a set of symlinks generated from the mapping in: icon-naming- utils/legacy- icon-mapping. xml
/usr/share/
So probably ubiquity is using one of these legacy icon names