/etc/X11/Xsession.d/50x11-common_determine-startup is in x11-common 1:7.7+13ubuntu3.
This file is owned by root:root, with mode 0o644.
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 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 | # $Id: 50x11-common_determine-startup 305 2005-07-03 18:51:43Z dnusinow $
# This file is sourced by Xsession(5), not executed.
# If no X session startup program was passed to the Xsession script as an
# argument (e.g., by the display manager), or if that program was not
# executable, fall back to looking for a user's custom X session script, if
# allowed by the options file.
if [ -z "$STARTUP" ]; then
if has_option allow-user-xsession; then
for STARTUPFILE in "$USERXSESSION" "$ALTUSERXSESSION"; do
if [ -e "$STARTUPFILE" ]; then
if [ -x "$STARTUPFILE" ]; then
STARTUP="$STARTUPFILE"
else
shell=${SHELL:-sh}
STARTUP="$shell $STARTUPFILE"
fi
break
fi
done
fi
fi
# If there is still nothing to use for a startup program, try the system
# default session manager, window manager, and terminal emulator.
if [ -z "$STARTUP" ]; then
if [ -x /usr/bin/x-session-manager ]; then
STARTUP=x-session-manager
elif [ -x /usr/bin/x-window-manager ]; then
STARTUP=x-window-manager
elif [ -x /usr/bin/x-terminal-emulator ]; then
STARTUP=x-terminal-emulator
fi
fi
# If we still have not found a startup program, give up.
if [ -z "$STARTUP" ]; then
ERRMSG="unable to start X session ---"
if has_option allow-user-xsession; then
ERRMSG="$ERRMSG no \"$USERXSESSION\" file, no \"$ALTUSERXSESSION\" file,"
fi
errormsg "$ERRMSG no session managers, no window managers, and no terminal" \
"emulators found; aborting."
fi
# vim:set ai et sts=2 sw=2 tw=80:
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