"reboot" from LXTerminal hangs at splash screen

[3guesses]

When I select Logout->Reboot from the taskbar menu, my laptop reboots no problem. However, if I execute the command "reboot" from an LXTerminal console, the system goes through the reboot process but then hangs at the Lubuntu splash screen.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: lxde (not installed)
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
Uname: Linux 4.15.0-20-generic i686
ApportVersion: 2.20.9-0ubuntu7
Architecture: i386
CurrentDesktop: LXDE
Date: Wed May 2 17:24:58 2018
InstallationDate: Installed on 2018-05-01 (1 days ago)
InstallationMedia: Lubuntu 18.04 LTS "Bionic Beaver" - Release i386 (20180426)
ProcEnviron:
 LANGUAGE=en_GB
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: lxde-metapackages
UpgradeStatus: No upgrade log present (probably fresh install)