Aqui vão os resultados da sugestão do colega Xterminator
Para o comando users-admin
** (users-admin:8659): CRITICAL **: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.
Para o comando network-admin
** (network-admin:8876): GTK-WARNING **: Unknown property: GtkComboBox.items
Esta aparece imediatamente a seguir á digitalização com ENTER
** (network-admin:8876): CRITICAL **: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.
Oxalá estas informações nos ponham mais perto da solução
João Fernando Machado Mão de Ferro