Public bug reported:
With Xubuntu 18.10/19.04 it is no longer possible to lock the screen on
the live system (after setting a password for the "xubuntu" user). With
previous versions (up to Xubuntu 18.04 LTS) it was easily possible to
set a password (using "passwd" on the command line) and then lock the
screen on the live system. With 18.10/19.04 the lock symbol is still
present in the Xfce menu but it is not working any more. Running the
command "light-locker-command --lock" reports the following error
message:
Received error message from the locker:
GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name
org.freedesktop.ScreenSaver was not provided by any .service files
Investigating the issue shows that the item "Screen Locker" in Settings
=> "Session and Startup" => "Application Autostart" is disabled on the
live system by default (this setting is enabled on the Xubuntu 18.04
live system). This leads to the following workaround:
* Go to Settings => "Session and Startup" => "Application Autostart"
* Enable "Screen Locker"
* Restart session (e.g. using "sudo systemctl restart lightdm.service")
After that, the lock screen is working as expected. So it should be
rather easy to fix this issue by changing the default value for this
setting.
Having a possibility to lock the screen is important even on a live
system e.g. when doing long-running copying/data rescue tasks involving
unlocked encrypted volumes.
** Affects: xubuntu-meta (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1835668
Title:
Locking screen on live system no longer possible with Xubuntu
18.10/19.04
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