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Building Ubuntu 18.04 fails with llvm-11

Hi all,
I was trying to build from scratch using the existing Ubuntu 18.04 Docker image and I'm getting this error:

E: Unable to locate package libllvm11
E: Unable to locate package llvm-11-dev
E: Unable to locate package libclang-11-dev
E: Unable to locate package clang-format-11
The command '/bin/sh -c apt-get update     && apt-get -y install curl wget lsb-release wget software-properties-common     && bash -c "$(wget -O - https://apt.llvm.org/llvm.sh)"     && apt-get update     && apt-get -y install debhelper cmake llvm libllvm11 llvm-11-dev libclang-11-dev        libelf-dev bison flex libedit-dev clang-format-11 python python-netaddr        python-pyroute2 luajit libluajit-5.1-dev arping iperf netperf ethtool        devscripts zlib1g-dev libfl-dev        pkg-config libssl-dev        git        clang        musl musl-tools musl-dev        capnproto        linux-headers-generic     && apt-get clean -y' returned a non-zero code: 100

It looks like the problem comes from https://apt.llvm.org/llvm.sh pointing by default to LLVM version 12 - I've fixed it by
modifying Dockerfile.18.04 to download the script locally and execute it with a parameter pointing to version 11 like here:

-    && bash -c "$(wget -O - https://apt.llvm.org/llvm.sh)" \
+    && wget -O /tmp/llvm.sh https://apt.llvm.org/llvm.sh \
+    && chmod +x /tmp/llvm.sh \
+    && bash -c "/tmp/llvm.sh 11" \

Sharing this to check if this is the right approach and also for others to use in case they fall into the same issue

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