In the meantime, I found some other posts of people with the same issue of failing updates which “could not be personalized.” It seems that mainly Macs with the M1-chip are affected. I encountered the issue again with the recent update to Ventura 13.5.1. I finally could install that update using “Recovery Mode” (“Safe mode” also failed). This, however, seems to indicate that it is not my network setup which is the culprit…
Best regards from Switzerland!
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