Package: qemu-user-binfmt
Version: 1:7.0+dfsg-7
Architectures that are not i386 or amd64 ship files like
/usr/lib/binfmt.d/qemu-x86_64.conf and /usr/lib/binfmt.d/qemu-i386.conf
However, i386 and amd64 flavours of the package ship neither.
The i386 flavour should ship x86_64 related files, and conversely.
Not having them prevents from using mmdebstrap to install an amd64
system from a i386 system:
I: automatically chosen mode: root
update-binfmts: warning: qemu-x86_64 not in database of installed binary
formats.
update-binfmts: exiting due to previous errors
W: qemu-x86_64 is not a supported binfmt name
E: amd64 can neither be executed natively nor via qemu user emulation
with binfmt_misc