Dear Maintainer,

after upgrade to buster notify-send stopped working (it just hangs for
around 45s).

I am using the mate desktop and have mate-notification-daemon installed.
I would expect the mate-notification-daemon be running, but it isn't.
If I start it manually notify-send works again. But after some time of
inactivity mate-notification-daemon just exits without error message.

"sudo apt purge plasma-workspace" helped

Looks like there were 2 conflicting implementations of
notification-daemon installed? don't know what exactly happened :-(

see also:
https://bugzilla.redhat.com/show_bug.cgi?id=1490959