This issue hasn't been seen since 18.04. Marking as resolved.
** Changed in: xfce4-notifyd (Ubuntu)
Status: Confirmed => Fix Released
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https://bugs.launchpad.net/bugs/1736416
Possibly a duplicate of bug 1744667.
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https://bugs.launchpad.net/bugs/1736416
Title:
/usr/lib/x86_64-linux-
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: xfce4-notifyd (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1736416