Simple Backup sbackup doesn't run on Lubuntu 12.10

I had this problem with sbackup 0.11.4 on Lubuntu, installed as Ubuntu 12.10 with lubuntu-core package installed.  When sudo sbackup is run, even with --no-dbus or --legacy-indicator, it still gives plenty of errors and notably, the message "No desktop session found".

Strangely, scheduled backups work though.  But when I tried instead:

sudo /usr/share/sbackup/sbackup-launch

that seems to work.

The bug might be because Lubuntu doesn't have 'gnome-session' or 'x-session-manager' running.  Instead, it uses 'lxsession'.