Hi Slavek and Michele,
Am 11.Aug.2023 um 16:16 schrieben Sie:
It is obvious according to the version number that you use the apt source Bookworm while installing on Trixie.
Ashes on my head. Yes you are correct with bookworm! When trixie arose, I changed my apt/sources.list accordingly, but - why? - I omitted the trinity-line. Corrected this and now the update run smoothly. Thanks for your effective answers.
Kind regards, Peter.