This error message was displayed to me (the attached image). It just appeared again during the installation process
** Attachment added: "Bildschirmfoto vom 2025-05-14 18-33-00.png" https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/2110739/+attachment/5877442/+files/Bildschirmfoto%20vom%202025-05-14%2018-33-00.png -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2110739 Title: update from 24.10 to 25.04 was faulty due to third party package sources To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/2110739/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
