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sudo apt-get install qemu-user-static_3.1+dfsg-8+deb10u8_amd64.deb

Get:1 http://ftp.ports.debian.org/debian-ports unstable InRelease [24.2 kB]
Err:1 http://ftp.ports.debian.org/debian-ports unstable InRelease
  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 5A88D659DCB811BB
Reading package lists... Done
W: GPG error: http://ftp.ports.debian.org/debian-ports unstable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 5A88D659DCB811BB
E: The repository 'http://ftp.debian-ports.org/debian unstable InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
apt update failed. Exit value: 100
mutltistrap with configuration file multistrap_debian-ports.conf failed

--- multistrap	2018-11-21 11:00:46.000000000 -0300
+++ multistrap_mod	2019-05-16 15:11:44.157699994 -0300
@@ -320,7 +320,8 @@
 $config_str .= " -o Apt::Get::AllowUnauthenticated=true"
 	if (defined $noauth);
 $config_str .= " -o Apt::Get::Download-Only=true";
-$config_str .= " -o Apt::Install-Recommends=false"
+$config_str .= " -o Apt::Install-Recommends=false";
+$config_str .= " -o Acquire::AllowInsecureRepositories=yes"
 	if (not defined $allow_recommends);
 $config_str .= " -o Dir=" . shellescape($dir);
 $config_str .= " -o Dir::Etc=" . shellescape("${dir}${etcdir}");

$ sudo chroot build/riscv64/riscv64-rootfs/
root@ubuntu:/#
root@ubuntu:/# whoami
root
root@ubuntu:/# du -sh /
364M    /
root@ubuntu:/#