/usr/share/xsessions/Lubuntu.desktop is calling "/usr/bin/lxsession -s
Lubuntu -e LXDE"

Contents of Lubuntu.desktop:

...
[Desktop Entry]
Name=Lubuntu
Comment=Lubuntu - Lightweight X11 desktop environment based on LXDE
Exec=/usr/bin/lxsession -s Lubuntu -e LXDE
Type=Application
...

Note: lxsession is not installed on default installation using iso from
5-11-2018.

I changed it to the following (assumming you want to use lxqt-session which is
installed by default) and rebooted:

...
[Desktop Entry]
Name=Lubuntu
Comment=Lubuntu - Lightweight X11 desktop environment based on LXDE
Exec=/usr/bin/lxqt-session
Type=Application
...

The original error is now gone, however, the screen freezes at sddm login 
immediately
after entering my credentials at the sddm greeter/login.

Here is a link to the log:

https://bionicmac.club/index.php/s/DtMBAr2KC5sZQNi

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https://bugs.launchpad.net/bugs/1770801

Title:
  Xsession: unable to launch "/usr/bin/lxsession -s Lubuntu -e LXDE"

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