[Bug 1812594] [NEW] Lubuntu 18.04 mistakenly sets the default lock problem to lxlock instead of light-locker

[Launchpad Bug Tracker]

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[Summary]

Instead to light-locker-command, the keyboard shortcut to lock the screen is bound to lxlock. The problem is, that lxlock is not included in the iso of the first two point releases (18.04 and 18.04.1) and therefore, the shortcut does not work.
The ability to lock the screen is a basic security feature and should work as expected, even with the provided shortcut.


[Test Case]

Steps to reproduce
------------------

1. Boot Lubuntu 18.04 (installed from an older iso, not 18.04.2)
2. Login
3. Delete ~/.config/lxsession/Lubuntu/desktop.conf
4. Logout
5. Login
6. Press CTRL-ALT-L

Expected behaviour
------------------

The desktop session is locked and requires the password to unlock.

Current behaviour
-----------------

Nothing happens.


[Regression Potential]

If the command in the Exec line does not exist, nothing is executed, so the behaviour does not change. Users with lxlock installed, won't notice any change in the behaviour.
lxlock is a shell script, which calls light-locker-command (see: https://github.com/lxde/lxsession/blob/master/lxlock/lxlock#L27), so the regression potential is very, very small.


[Other Info]

Lubuntu uses another desktop environment from version 18.10 onwards. The
only version, which contains the patched file is 18.04. The Lubuntu Team
does not support Xenial anymore (16.04 has reached its end of life after
3 years of community support).


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[Previous Description]

Lubuntu 18.04 lxsession defines `lxlock` as the default for
"lock_manager/command" which lxhotkey calls via `lxsession-default lock`
when Ctrl-Alt-L is pressed. This should be changed in
/etc/xdg/lxsession/Lubuntu/desktop.conf to `light-locker`.

** Affects: lubuntu-default-settings (Ubuntu)
     Importance: Medium
         Status: Invalid

** Affects: lubuntu-default-settings (Ubuntu Bionic)
     Importance: Medium
     Assignee: apt-ghetto (apt-ghetto)
         Status: In Progress


** Tags: amd64 apport-bug bionic
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Lubuntu 18.04 mistakenly sets the default lock problem to lxlock instead of light-locker
https://bugs.launchpad.net/bugs/1812594
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