When having MATE and Unity both installed, a conflict can occur with the notifications daemon. The MATE daemon will prevent the unity daemon from starting.
The main indicator of this problem (when logged into Unity):
pgrep notify-osd returns no process ID
volume OSD (on screen display) doesn’t work
add-ons like notifyosdconf do nothing
OSD theme doesn’t match unity theme
The quick fix:
sudo apt-get remove mate-notification-daemon
pkill notify-osd
Test:
notify-send test
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