Para openSUSE Tumbleweed execute o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/X11:lxde/openSUSE_Tumbleweed/X11:lxde.repo
zypper refresh
zypper install lxsession
Para openSUSE 11.4 execute o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/X11:lxde/openSUSE_11.4/X11:lxde.repo
zypper refresh
zypper install lxsession
Para 15.4 execute o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/X11:lxde/15.4/X11:lxde.repo
zypper refresh
zypper install lxsession