The items included with gimp-plugin-registry already exist within the package from that PPA, which is why you're seeing the error. Furthermore, PPA package installations are not supported.
** Changed in: gimp-plugin-registry (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1775942 Title: package gimp-plugin-registry (not installed) failed to install/upgrade: forsøger at overskrive '/usr/lib/gimp/2.0/plug-ins /wavelet-decompose', som også er i pakken gimp 2.10.2+omg- 0ubu18.04.1~ppa To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gimp-plugin-registry/+bug/1775942/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs