ubuntu-22.04.3-desktop-amd64/casper/filesystem/usr/lib/systemd/user/session-migration.service

[Unit]
Description=Session Migration
Before=graphical-session-pre.target
Requires=dbus.socket

[Service]
Type=oneshot
ExecStart=/usr/bin/session-migration

[Install]
WantedBy=graphical-session-pre.target