/usr/bin/lightdm-unity8-session is in unity8-desktop-session-mir 1.0.12+15.10.20150609-0ubuntu1.
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 10 11 12 13 14 15 16 17 18 19 20 21 | #!/bin/sh
#
# If no X server is available, just run upstart, otherwise fall back to the
# traditional X-based desktop session startup.
#
if test -z "$DISPLAY" && [ $DESKTOP_SESSION != "unity8-lxc" ]; then
# TODO: The following block is to work around the OOBE wizard for the phone.
# See LP: #1435877.
if [ ! -f $HOME/.config/ubuntu-system-settings/wizard-has-run ]; then
mkdir -p $HOME/.config/ubuntu-system-settings
touch $HOME/.config/ubuntu-system-settings/wizard-has-run
fi
export QT_QPA_PLATFORM=ubuntumirclient
export UNITY_INDICATOR_PROFILE=desktop
export UBUNTU_PLATFORM_API_BACKEND=desktop_mirclient
exec upstart --user
else
exec /usr/sbin/lightdm-session "$@"
fi
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