diff --git a/scripts/bootstrap-to-docker.sh b/scripts/bootstrap-to-docker.sh
index 95131d7..8f486bd 100755
--- a/scripts/bootstrap-to-docker.sh
+++ b/scripts/bootstrap-to-docker.sh
@@ -12,21 +12,31 @@ if test -f /etc/setup-debootstrap.conf; then
     . /etc/setup-debootstrap.conf
 fi
 
-tmpdir=${tmpdir:-"/var/tmp"}
+tmpdir=${tmpdir:-"/var/tmp/chroots"}
+test -d "${tmpdir}" || mkdir -p "${tmpdir}"
 docker_user=${docker_user:-${USER}}
+if test -z "${ports[@]}"; then
+    ports=( armhf powerpc ppc64el s390x arm64 )
+    qemus=( arm   ppc     ppc64   s390x armb  )
+fi
+numports=${#ports[@]}
 if test -z "$archs"; then
     case "$(dpkg --print-architecture)" in
-        (amd64) archs="i386 amd64";;
+        (amd64) archs="amd64 i386";;
         (*) archs=$(dpkg --print-architecture);;
     esac
+    for ((i=0; i<${num}; ++i)); do
+        if test -x /usr/bin/qemu-${qemus[$i]}-static; then
+            archs+=" ${ports[$i]}"
+        fi
+    done
 fi
 ubuntu_qt5="yakkety xenial wily vivid trusty"
-ubuntu_qt4="precise"
-debian_qt5="stretch jessie sid"
-debian_qt4="wheezy"
-debian_unsupported="buster" # not in /usr/share/debootstrap/scripts
+debian_qt5="jessie sid"
+debian_qt4=""
+# not yet successfully installable: debian stretch and buster
 
-ubuntu=("${ubuntu_qt5}" "${ubuntu_qt4}")
+ubuntu=("${ubuntu_qt5}")
 debian=("${debian_qt5}" "${debian_qt4}")
 distros=(${distros:-"${ubuntu[@]}" "${debian[@]}"})
 
@@ -38,8 +48,9 @@ packages_base="software-properties-common apt-transport-https dpkg-dev lsb-relea
 package_not_in_xenial=""
 package_not_in_xenial_qt5=""
 
-packages=(${packages:-"${packages_base} ${packages_qt5}" "${packages_base} ${packages_qt4}" "${packages_base} ${packages_qt5}" "${packages_base} ${packages_qt4}"})
-
+if test -z "${packages[@]}"; then
+    packages=("${packages_base} ${packages_qt5}" "${packages_base} ${packages_qt5}" "${packages_base} ${packages_qt4}")
+fi
 if test -z "${index}" -a "${#distros[@]}" -ne "${#packages[@]}"; then
     echo "**** ERROR: number of distribution lists doesn't match package lists" 1>&2
     echo "            distribution lists: ${#distros[@]}" 1>&2
@@ -47,9 +58,40 @@ if test -z "${index}" -a "${#distros[@]}" -ne "${#packages[@]}"; then
     exit 1
 fi
 
+fastmode=0;
+limit=
+while [ $# -gt 0 ]; do
+    case "$1" in
+        (-f|--fastmode) fastmode=1;;
+        (-l|--limit) shift; limit=$1;;
+        (*)
+            echo "**** ERROR: unknown option $1" 1>&2
+            exit 1;;
+    esac
+    shift
+done
+
+error() {
+    tmpdir=$2
+    disto=$3
+    arch=$4
+    echo "**** ERROR at ${0}:${1}" 1>&2
+    echo ".... on $(eval echo \"${BASH_COMMAND}\")" 1>&2
+    echo ".... tmpdir=$tmpdir arch=$arch distro=$distro" 1>&2
+    
+    exit 1
+}
+
 for ((i=0; i<${#distros[@]}; ++i)); do
     package="${packages[${index:-$i}]}"
     for distro in ${distros[$i]}; do
+        if test -n "$limit" -a "$distro" != "$limit"; then
+            continue
+        fi
+        if ! test -e /usr/share/debootstrap/scripts/${distro}; then
+            echo "**** WARNING: skipping unsupported ${distro}" 1>&2
+            continue;
+        fi
         ubuntus="${ubuntu[@]}"
         if test "${ubuntus//${distro}/}" != "${ubuntus}"; then
             type="ubuntu"
@@ -57,12 +99,37 @@ for ((i=0; i<${#distros[@]}; ++i)); do
             type="debian"
         fi
         for arch in ${archs}; do
+            trap 'error "${LINENO}" "${tmpdir}" "${disto}" "${arch}"' ERR SIGINT
             echo "******** process $type $distro $arch ********" 1>&2
             if test -d "${tmpdir}/${distro}-${arch}"; then
                 echo " ++++    already exists ${tmpdir}/${distro}-${arch}" 1>&2
+                if test $fastmode -eq 1; then
+                    continue;
+                fi
             else
-                echo " ----    install ${tmpdir}/${distro}-${arch}" 1>&2
-                sudo debootstrap --arch="$arch" "$distro" "${tmpdir}/${distro}-${arch}"
+                if test "$(dpkg --print-architecture)" = "$arch" -o \( "$(dpkg --print-architecture)" = amd64 -a "$arch" = i386 \) ; then
+                    echo " ----    install ${tmpdir}/${distro}-${arch}" 1>&2
+                    sudo debootstrap --arch="$arch" "$distro" "${tmpdir}/${distro}-${arch}"
+                else
+                    for ((i=0; $i<$numports; ++i)); do
+                        if test "${ports[$i]}" = "${arch}"; then
+                            break;
+                        fi
+                    done
+                    qemu="${qemus[$i]}"
+                    if ! test -e /usr/bin/qemu-${qemu}-static; then
+                        echo "**** WARNING: no emulator ${qemu} found, skipping ${arch}" 1>&2
+                        continue;
+                    fi
+                    arch=${arch#*-}
+                    echo " ----    install on $qemu ${tmpdir}/${distro}-${arch}" 1>&2
+                    sudo debootstrap --foreign --arch="$arch" "$distro" "${tmpdir}/${distro}-${arch}"
+                    sudo cp /usr/bin/qemu-${qemu}-static "${tmpdir}/${distro}-${arch}/usr/bin/qemu-${qemu}-static"
+                    sudo DEBIAN_FRONTEND=noninteractive DEBCONF_NONINTERACTIVE_SEEN=true LC_ALL=C LANGUAGE=C LANG=C chroot "${tmpdir}/${distro}-${arch}" /debootstrap/debootstrap --second-stage || \
+                        sudo chroot "${tmpdir}/${distro}-${arch}" apt-get -o Acquire::ForceIPv4=true -y -f install && \
+                            sudo DEBIAN_FRONTEND=noninteractive DEBCONF_NONINTERACTIVE_SEEN=true LC_ALL=C LANGUAGE=C LANG=C chroot "${tmpdir}/${distro}-${arch}" /debootstrap/debootstrap --second-stage
+                    sudo DEBIAN_FRONTEND=noninteractive DEBCONF_NONINTERACTIVE_SEEN=true LC_ALL=C LANGUAGE=C LANG=C chroot "${tmpdir}/${distro}-${arch}" dpkg --configure -a
+                fi
             fi
             echo " ----    prevent packages in ${tmpdir}/${distro}-${arch}" 1>&2
             for f in "dbus" "libpam-systemd*" "packagekit*" "policykit*" "colord"; do
@@ -78,18 +145,20 @@ fi
 EOF1
             done
             echo " ----    upgrade ${tmpdir}/${distro}-${arch}" 1>&2
-            sudo chroot "${tmpdir}/${distro}-${arch}" apt-get update
-            sudo chroot "${tmpdir}/${distro}-${arch}" apt-get -y upgrade
-            sudo chroot "${tmpdir}/${distro}-${arch}" apt-get install -y python-software-properties software-properties-common || \
-                sudo chroot "${tmpdir}/${distro}-${arch}" apt-get install -y software-properties-common
+            sudo chroot "${tmpdir}/${distro}-${arch}" apt-get -o Acquire::ForceIPv4=true update
+            sudo chroot "${tmpdir}/${distro}-${arch}" apt-get -o Acquire::ForceIPv4=true -y -f install
+            sudo chroot "${tmpdir}/${distro}-${arch}" apt-get -o Acquire::ForceIPv4=true -y upgrade
+            sudo chroot "${tmpdir}/${distro}-${arch}" apt-get -o Acquire::ForceIPv4=true install -y python-software-properties software-properties-common || \
+                sudo chroot "${tmpdir}/${distro}-${arch}" apt-get -o Acquire::ForceIPv4=true install -y software-properties-common
             if test "${distro}" != "jessie" -a "${distro}" != "sid"; then
                 sudo chroot "${tmpdir}/${distro}-${arch}" add-apt-repository universe || \
-                    sudo chroot "${tmpdir}/${distro}-${arch}" add-apt-repository "deb http://archive.ubuntu.com/ubuntu ${distro} universe"
+                    ( test "$type" != "debian" && \
+                      sudo chroot "${tmpdir}/${distro}-${arch}" add-apt-repository "deb http://archive.ubuntu.com/ubuntu ${distro} universe" )
             fi
-            sudo chroot "${tmpdir}/${distro}-${arch}" apt-get update
-            sudo chroot "${tmpdir}/${distro}-${arch}" apt-get -y dist-upgrade
+            sudo chroot "${tmpdir}/${distro}-${arch}" apt-get -o Acquire::ForceIPv4=true update
+            sudo chroot "${tmpdir}/${distro}-${arch}" apt-get -o Acquire::ForceIPv4=true -y dist-upgrade
             echo " ----    install ${package} to ${tmpdir}/${distro}-${arch}" 1>&2
-            sudo chroot "${tmpdir}/${distro}-${arch}" apt-get install -y ${package}
+            sudo chroot "${tmpdir}/${distro}-${arch}" apt-get -o Acquire::ForceIPv4=true install -y ${package}
             echo " ----    import ${tmpdir}/${distro}-${arch} to ${docker_user}/${type}:${distro}-${arch}" 1>&2
             cd "${tmpdir}/${distro}-${arch}"
             sudo tar c . | docker import - "${docker_user}/${type}:${distro}-${arch}"