I have the same problem with the rncbc Launchpad PPA repo for audio programs from Rui Nuno Capelo. I haven't found a proper solution but there is a workaround to force APT to trust those old signing keys. Don't tell anyone I posted this as it obviously is a less secure hack so I won't put it here but check this link - https://neilzone.co.uk/2026/01/dealing- ... r-details/
From that page:
My understanding is that - as the last line suggests - there has been a change in key-handling policy by apt, and that keys which were previously acceptable are (or, rather, will be) no longer acceptable by default.
The “correct” way of solving this is for the repository provider to update their signing key to something which is compliant.
Statistics: Posted by sunrat — 2026-02-02 05:59