Anyway, I went the whole hog and deleted all the portions of my hard disk and installed Kubuntu 18.04, then one-keyed the restoration process from Aptik. But no doubt, doing a completely new install is a clean way to begin. Restoring directly afterwards from Aptik gives good results, although not all programs survive the process and do not get installed. So far I have not suffered from any compatibility problems, but will advise the forum if they occur.
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