I've added another user and no difference. Can easily toggle between them. I'm using a fresh install, as well. I am on a virtual machine, but that shouldn't matter, unless there's some problem with the physical hardware, such as some sort of graphics driver. If you do have such a problem, I would expect you to have the same issue if you booted the installation media, logged out, select the Openbox session and tried to log in again (the password is blank, so just go to the password area and hit enter).
You might want to look in /var/log. Certainly, start with sddm.log. Failing that, you can look in syslog or dmesg. It's also possible to look at Xorg.0.log but I think that's unlikely given that X is already started. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1804554 Title: 18.10: lubuntu sddm crashes with openbox session To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lxqt-session/+bug/1804554/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs