Hello! Since we also saw the same FTBFS in Ubuntu, I have looked into it briefly today. It seems that the test-is-public-builtin data needs to be updated for the test to work as expected. This was fixed in libpsl 0.21.1 per this commit:
https://github.com/rockdaboot/libpsl/commit/f364cea73e351ce62e0b337fd1fbc21e70b52d56 Cherry-picking the above commit (or simply pulling in 0.21.1) should fix this error. Cheers! -- Ćukasz 'sil2100' Zemczak Foundations Team lukasz.zemc...@canonical.com www.canonical.com