Installing 'mailnag-messagingmenu-plugin' does not help.
But "dconf read /com/canonical/indicator/messages/applications" returns "['mailnag-messagingmenu.desktop']" So it's registered.
Installing 'mailnag- messagingmenu- plugin' does not help.
But "dconf read /com/canonical/ indicator/ messages/ applications" returns messagingmenu. desktop' ]"
"['mailnag-
So it's registered.