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diff --git a/taskcluster/docker/update-verify/Dockerfile b/taskcluster/docker/update-verify/Dockerfile
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+# This is an LTS! We should upgrade after the next LTS is released, unless
+# we've switched to the in-tree debian base images by then.
+FROM ubuntu:20.04
+
+MAINTAINER release@mozilla.com
+
+RUN dpkg --add-architecture i386 && apt-get -q update \
+    # p7zip-full is for extracting Windows and OS X packages
+    # wget is for downloading update.xml, installers, and MARs
+    # libgtk-3-0 and libgtk2.0-0 are required to run the Firefox updater
+    && apt-get -q --yes install p7zip-full wget libgtk-3-0 libgtk-3.0:i386 libgtk2.0-0 libgtk2.0-0:i386 \
+    && apt-get clean
+
+RUN mkdir /builds
+RUN groupadd -g 1000 worker
+RUN useradd -u 1000 -g 1000 -d /builds/worker -s /bin/bash -m worker
+WORKDIR /builds/worker
+
+VOLUME /builds/worker/.cache
+VOLUME /builds/worker/checkouts
+
+RUN mkdir /build
+# %include python/mozbuild/mozbuild/action/tooltool.py
+ADD topsrcdir/python/mozbuild/mozbuild/action/tooltool.py /build/tooltool.py
+
+# %include testing/mozharness/external_tools/robustcheckout.py
+ADD topsrcdir/testing/mozharness/external_tools/robustcheckout.py /usr/local/mercurial/robustcheckout.py
+
+# %include taskcluster/docker/recipes/hgrc
+COPY topsrcdir/taskcluster/docker/recipes/hgrc /etc/mercurial/hgrc.d/mozilla.rc
+
+# %include taskcluster/docker/recipes/install-mercurial.sh
+ADD topsrcdir/taskcluster/docker/recipes/install-mercurial.sh /build/install-mercurial.sh
+ADD system-setup.sh /tmp/system-setup.sh
+RUN bash /tmp/system-setup.sh
+
+# %include taskcluster/scripts/run-task
+ADD topsrcdir/taskcluster/scripts/run-task /builds/worker/bin/run-task
+# %include taskcluster/scripts/misc/fetch-content
+ADD topsrcdir/taskcluster/scripts/misc/fetch-content /builds/worker/bin/fetch-content
+RUN chown -R worker:worker /builds/worker/bin && chmod 755 /builds/worker/bin/*
+ENV PATH $PATH:/builds/worker/bin
+
+# Set variable normally configured at login, by the shells parent process, these
+# are taken from GNU su manual
+ENV           HOME          /builds/worker
+ENV           SHELL         /bin/bash
+ENV           USER          worker
+ENV           LOGNAME       worker
+ENV           HOSTNAME      taskcluster-worker
+ENV           LANG          en_US.UTF-8
+ENV           LC_ALL        en_US.UTF-8
+
+# Set a default command useful for debugging
+CMD ["/bin/bash", "--login"]