Thank you NMGLugers, Thank you members at our recent meeting, especially Geoff, for encouragement and guidance in upgrading from Jessie to Stretch on an older laptop. I had done the Jessie updates. At the meeting I changed 'sources.list' entries from jessie to stretch. The long download and longer install almost failed when we ran out of time. Geoff suggested and then insisted 'Hibernate' was my only choice. Correct. I as able to Hibernate, pull the power and with no battery resume at home. Upgrade works, but has much slower boot time. It may be the newer kernel (one online comment suggests this). In any event I will have some issues for next meeting: how to select obsolete files to remove and how to check that no old config file is holding me back. Thank you, Ted P.