Alex,
we have tried to replicate the problem.... with no luck.
* We created a clean VM (amd64) running Stretch (ssh server/base files only)
* THe VM has been updated to SID
-8<--
root@testmultiarch:~# dpkg --add-architecture arm64
root@testmultiarch:~# apt install build-essential
...
root@testmultiarch:~# apt-get build-dep -a arm64 qemu
Reading package lists... Done
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer
required:
dh-python libbind9-140 libdns162 libicu57 libisc160 libisccc140
libisccfg140 liblwres141 libperl5.24 libpython3.5-minimal
libpython3.5-stdlib python3.5 python3.5-minimal rename sgml-base tcpd
xml-core
Use 'apt autoremove' to remove them.
The following NEW packages will be installed:
adwaita-icon-theme autoconf automake autopoint autotools-dev binutils-
[...cut cut cut...]
x11proto-dev x11proto-fixes-dev x11proto-input-dev x11proto-randr-dev
x11proto-record-dev x11proto-xext-dev x11proto-xf86vidmode-dev
x11proto-xinerama-dev xfslibs-dev:arm64 xfsprogs:arm64
xorg-sgml-doctools xtrans-dev zlib1g:arm64 zlib1g-dev:arm64
0 upgraded, 482 newly installed, 0 to remove and 0 not upgraded.
Need to get 200 MB of archives.
After this operation, 864 MB of additional disk space will be used.
Do you want to continue? [Y/n]
-8<--
It works for a while but eventually completes the installation without any
further problem.
Can you please help us to replicate the erroneous behavior you have got?
renzo
(tnx to Diego Zuccato who actually ran the tests)