/usr/share/lightdm-remote-session-freerdp/freerdp-session is in lightdm-remote-session-freerdp 1.0-0ubuntu2.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | #!/bin/bash
if [ -e ~/.freerdp-socket ]; then
/usr/lib/x86_64-linux-gnu/lightdm-remote-session-freerdp/socket-sucker | /usr/bin/xfreerdp --plugin rdpsnd.so -f --from-stdin
else
zenity --warning --text="Unable to locate FreeRDP socket"
fi;
rm -f ~/.freerdp-socket
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