As was noted on the upstream issue, this is working as designed. You cannot run a 64bit image on a 32bit host. Also, upstream does not officially support 32bit hosts, so you will need to use something like debootstrap to create your own.
As was noted on the upstream issue, this is working as designed. You
cannot run a 64bit image on a 32bit host. Also, upstream does not
officially support 32bit hosts, so you will need to use something like
debootstrap to create your own.