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Comment apt-get installer dans a GitHub Actions workflow?

ayi

In the new GitHub Actions, I am trying to install a package in order to use it in one of the next steps. 
`name: CI
on: [push, pull_request]
jobs: 
translations: 
runs-on: ubuntu-latest 
steps:

uses: actions/checkout@v1 
with: 
fetch-depth: 1
name: Install xmllint 
run: apt-get install libxml2-utils 
…
<pre><code class="lang-auto">
However this fails with

</code></pre>
Run apt-get install libxml2-utils 
apt-get install libxml2-utils 
shell: /bin/bash -e {0} 
E: Could not open lock file /var/lib/dpkg/lock-frontend - open (13: Permission denied) 
E: Unable to acquire the dpkg frontend lock (/var/lib/dpkg/lock-frontend), are you root? 
##[error]Process completed with exit code 100.
<pre><code class="lang-auto">
What's the best way to do this? Do I need to reach for Docker?

Source : Stack Overflow</code></pre>

ayi_2

The <a href="https://docs.github.com/en/actions/using-github-hosted-runners/about-github-hosted-runners">docs</a> say:
The Linux and macOS virtual machines both run using passwordless <code>sudo</code>. When you need to execute commands or install tools that require more privileges than the current user, you can use <code>sudo</code> without needing to provide a password.
So simply doing the following should work:
<pre><code class="lang-auto">- name: Install xmllint
run: sudo apt install -y libxml2-utils

</code></pre>