[Fixed] - Erlang not installing properly with mix

Dockerfile

@@ -10,7 +10,7 @@ ENV MAVEN_VERSION 3.6.0
 ENV SBT_VERSION 1.3.3
 ENV GRADLE_VERSION 5.6.4
 ENV RUBY_VERSION 3.1.1
-ENV MIX_VERSION 1.0
+ENV MIX_VERSION 2.0
 ENV COMPOSER_ALLOW_SUPERUSER 1
 
 # programs needed for building
@@ -128,8 +128,13 @@ RUN wget https://packages.erlang-solutions.com/erlang-solutions_${MIX_VERSION}_a
     sudo dpkg -i erlang-solutions_${MIX_VERSION}_all.deb && \
     sudo rm -f erlang-solutions_${MIX_VERSION}_all.deb && \
     sudo apt-get update && \
-    sudo apt-get install -y esl-erlang && \
-    sudo apt-get install -y elixir
+    sudo apt-get install -y esl-erlang
+# Install Elixir
+WORKDIR /tmp/elixir-build
+RUN git clone https://github.com/elixir-lang/elixir.git
+WORKDIR elixir
+RUN make && make install
+WORKDIR /
 
 # install conan
 RUN apt-get install -y python-dev && \

features/features/package_managers/erlangmk_spec.rb

@@ -13,16 +13,11 @@
     puts 'Erlang.mk project created'
     erlang_developer.run_license_finder
     expect(erlang_developer).to be_seeing_line 'amqp_client, 3.8.5, unknown'
-    expect(erlang_developer).to be_seeing_line 'aten, 0.5.3, "Apache 2.0, Mozilla Public License 1.1"'
     expect(erlang_developer).to be_seeing_line 'cowboy, 2.6.1, ISC'
     expect(erlang_developer).to be_seeing_line 'cowlib, 2.7.0, ISC'
     expect(erlang_developer).to be_seeing_line 'credentials_obfuscation, 2.0.0, "Apache 2.0, Mozilla Public License 1.1"'
     expect(erlang_developer).to be_seeing_line 'cuttlefish, 2.2.0, unknown'
-    expect(erlang_developer).to be_seeing_line 'gen_batch_server, 0.8.2, "Apache 2.0, Mozilla Public License 1.1"'
-    expect(erlang_developer).to be_seeing_line 'getopt, 1.0.1, "New BSD"'
-    expect(erlang_developer).to be_seeing_line 'goldrush, 0.1.9, ISC'
     expect(erlang_developer).to be_seeing_line 'jsx, 2.9.0, MIT'
-    expect(erlang_developer).to be_seeing_line 'lager, 3.7.0, "Apache 2.0"'
     expect(erlang_developer).to be_seeing_line 'lager, 3.8.0, "Apache 2.0"'
     expect(erlang_developer).to be_seeing_line 'observer_cli, 1.5.4, MIT'
     expect(erlang_developer).to be_seeing_line 'ra, 1.1.2, "Apache 2.0, Mozilla Public License 1.1"'