Have a look at the logs on each package build daemons:
amd64/i386 package build logs
armel package build logs
armhf package build logs
arm64 package build logs
Have a look at the output on each image/platform build daemons:
amd64/i386 base image
amd64/i386 cloud image
amd64/i386 vm image
arm64 base image
arm64 cloud image
ARM SBC
WSL rootfs