/usr/lib/systemd/user/telepathy-mission-control-5.service is in telepathy-mission-control-5 1:5.16.4-2ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Description=Telepathy Mission Control service
Documentation=man:mission-control-5(8)
[Service]
Type=dbus
BusName=org.freedesktop.Telepathy.AccountManager
ExecStart=/usr/lib/telepathy/mission-control-5
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