If you compare https://launchpadlibrarian.net/178524405/buildlog_ubuntu-utopic-i386.mupen64plus-core_2.0-6_UPLOADING.txt.gz and https://launchpadlibrarian.net/178524404/buildlog_ubuntu-utopic-amd64.mupen64plus-core_2.0-6_UPLOADING.txt.gz than you can see that the i386 (the one with the wrong symlink) has an error:
grep: ../mupen64plus-data/DEBIAN/control: No such file or directory
If this grep wouldn't fail than it would be detected that it is an "all" dependency from a non-all package
If you compare https:/ /launchpadlibra rian.net/ 178524405/ buildlog_ ubuntu- utopic- i386.mupen64plu s-core_ 2.0-6_UPLOADING .txt.gz and https:/ /launchpadlibra rian.net/ 178524404/ buildlog_ ubuntu- utopic- amd64.mupen64pl us-core_ 2.0-6_UPLOADING .txt.gz than you can see that the i386 (the one with the wrong symlink) has an error:
grep: ../mupen64plus- data/DEBIAN/ control: No such file or directory
If this grep wouldn't fail than it would be detected that it is an "all" dependency from a non-all package