Would you use a PureOS "rolling release" or do you want a "stable" PureOS?

Note the warning that the Byzantium ISO is “experimental”. That was 5 days ago. I don’t know whether that would have changed in the last 5 days. If not then the safe approach is to take an Amber ISO, let that fully install itself, and then change over from Amber to Byzantium (as per the first link). If this is a crash test dummy computer then just go ahead and use the Byzantium ISO regardless.

Note that an ISO, any ISO, is really only relevant for a new install. If this is an existing PureOS install then just change over from Amber to Byzantium (as per the first link).

The first link does not say it explicitly but I believe you will want to comment out Amber when adding Byzantium.

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