installation issue with jetson_linux_r32.7.2 and ubuntu:focal

[mmellema-hva]

hi, I've got a weird issue. Somehow I cannot install the l4t package on ubuntu:focal. I've tried several versions. On Bionic it works, but focal gives the error: /usr/bin/rm : No such file or directory

Here's my dockerfile

FROM balenalib/jetson-xavier-nx-devkit-emmc-ubuntu:focal
ENV DEBIAN_FRONTEND=noninteractive
ENV UDEV=on

RUN sed -i 's/r32.6 main/r32.7 main/g' /etc/apt/sources.list.d/nvidia.list

RUN echo 'deb https://repo.download.nvidia.com/jetson/common r32.4 main' >> /etc/apt/sources.list.d/nvidia.list && \
    echo 'deb https://repo.download.nvidia.com/jetson/t194 r32.4 main' >> /etc/apt/sources.list.d/nvidia.list


RUN apt-get -qq update && \
    apt install -q -y \
    # l4t
    wget tar lbzip2 git  python3-pip \
    python3.8-dev \
    #project
    supervisor \
    # cleanup
    nvidia-container-csv-cuda- libopencv-python- libvisionworks-sfm-dev- libvisionworks-dev-  \
    libvisionworks-samples- libnvinfer-samples- \
    nvidia-container-csv-cudnn- libvisionworks-tracking-dev- vpi1-samples- libopencv- libnvinfer-doc- \
    libnvparsers-dev- libnvidia-container0- nvidia-container-csv-visionworks- \
    graphsurgeon-tf- libopencv-samples- python3-libnvinfer-dev- libnvinfer-plugin-dev- \
    nvidia-container-toolkit- libnvinfer-dev- libvisionworks- libopencv-dev- \
    vpi1-dev- vpi1-demos-  python3-libnvinfer-dev- opencv-licenses- nvidia-container-csv-tensorrt- \
    libnvonnxparsers-dev-  uff-converter-tf- nvidia-docker2- libvisionworks-sfm- \
    libnvidia-container-tools- nvidia-container-runtime-  libvisionworks-tracking- \
    # alpr \
    libnvinfer-bin cuda-cudart-10-2 libopenblas-dev libnvinfer7 libnvinfer-plugin7 libnvparsers7 libnvonnxparsers7 \
    #ndi gst plugin
    libavahi-common-dev libavahi-client-dev \
    # app \
    libxml2-dev libxslt-dev libcairo2-dev unzip \
    # tegra \
    libgstreamer1.0-0 gstreamer1.0-plugins-base \
    gobject-introspection gstreamer1.0-plugins-good \
    python3-gi python3-gst-1.0 libgirepository1.0-dev gir1.2-gstreamer-1.0 libgstreamer1.0-dev  \
    gstreamer1.0-plugins-bad \
    gstreamer1.0-tools \
    # pycharm
    rsync openssh-server


RUN  mkdir /usr/src/l4t && \
    cd /usr/src/l4t && wget --quiet https://developer.nvidia.com/embedded/l4t/r32_release_v7.1/t186/jetson_linux_r32.7.1_aarch64.tbz2


RUN  cd /usr/src/l4t &&  tar xvfj jetson_linux_r32.7.1_aarch64.tbz2  && rm jetson_linux_r32.7.1_aarch64.tbz2

RUN    cd /usr/src/l4t/Linux_for_Tegra && \
    sed -i 's/install --owner=root --group=root \"${QEMU_BIN}\" \"${L4T_ROOTFS_DIR}\/usr\/bin\/\"/#install --owner=root --group=root \"${QEMU_BIN}\" \"${L4T_ROOTFS_DIR}\/usr\/bin\/\"/g' nv_tegra/nv-apply-debs.sh && \
    sed -i 's/chroot . \//  /g' nv_tegra/nv-apply-debs.sh && \
    /bin/bash ./apply_binaries.sh -r / --target-overlay && cd .. \
    rm -rf Linux_for_Tegra && \
    echo "/usr/lib/aarch64-linux-gnu/tegra" > /etc/ld.so.conf.d/nvidia-tegra.conf && ldconfig && \
     apt install -o DPkg::Options::="--force-confold" -y -q nvidia-l4t-gstreamer

when I replaced tar with tar --skip-old-files in apply_binaries.sh and l4t_extact_deb.sh it does work. focal is supported by Nvidia