echo $PATH
/usr/lib/lightdm/lightdm:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games
so /usr/local/bin is before /usr/bin in my user's path.
But what about root's path? Maybe /usr/bin/lxlock will be used that way?
-----
/usr/bin/lxlock:
...
# Try to lock the screen with thos applications (in this order) :
# lighdtm, xscreensaver, gnome-screensaver, slock, slock, i3lock and
xdg-screensaver
if test x"`which dm-tool 2>/dev/null`" != x""; then
dm-tool switch-to-greeter
elif `dbus-send --system --print-reply --dest=org.freedesktop.DBus
/org/freedesktop/DBus org.freedesktop.DBus.GetNameOwner
string:org.freedesktop.DisplayManager > /dev/null 2>&1` ; then
seat="$XDG_SEAT_PATH"
dbus-send --system --print-reply --dest=org.freedesktop.DisplayManager
"$seat" org.freedesktop.DisplayManager.Seat.SwitchToGreeter \
2> /dev/null
elif test x"`which xscreensaver-command 2>/dev/null`" != x""; then
xscreensaver-command -lock
elif test x"`which gnome-screensaver-command 2>/dev/null`" != x""; then
gnome-screensaver-command --lock
elif test x"`which slock 2>/dev/null`" != x""; then
slock
elif test x"`which xlock 2>/dev/null`" != x""; then
xlock $*
elif test x"`which i3lock 2>/dev/null`" != x""; then
i3lock -d
# In the end, try to fallback to xdg-screensaver. Don't do at the first try,
# because if lxlock is called by xdg-screensaver, we may enter a loop.
else
xdg-screensaver lock
fi
exit 0
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https://bugs.launchpad.net/bugs/1205384
Title:
Lock can be circumvented by switching to console
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https://bugs.launchpad.net/lxde/+bug/1205384/+subscriptions
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