-<pre><code><span class="userinput">sudo gpg --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3
-\curl -sSL https://get.rvm.io | sudo bash -s stable --ruby=2.1
-sudo adduser "$USER" rvm
+<pre><code># <span class="userinput">dnf module enable ruby:2.7</span>
+# <span class="userinput">dnf install --enablerepo=devel ruby ruby-devel</span></code></pre>
+</notextile>
+
+h3. Debian and Ubuntu
+
+Debian 10 (buster) and Ubuntu 18.04 (bionic) ship with Ruby 2.5, which is too old for Arvados. Use "RVM":#rvm to install a newer version of Ruby (we recommend installing version 2.7 or newer).
+
+Debian 11 (bullseye) and Ubuntu 20.04 (focal) and later ship with Ruby 2.7 or newer, which is sufficient for Arvados.
+
+<notextile>
+<pre><code># <span class="userinput">apt-get --no-install-recommends install ruby ruby-dev</span></code></pre>
+</notextile>
+
+h2(#rvm). Option 2: Install with RVM
+
+h3. Install gpg and curl
+
+h4. Alma/CentOS/Red Hat/Rocky
+
+<pre>
+dnf install gpg curl which
+</pre>
+
+h4. Debian and Ubuntu
+
+<pre>
+apt-get --no-install-recommends install gpg curl
+</pre>
+
+h3. Install RVM, Ruby and Bundler
+
+<notextile>
+<pre><code># <span class="userinput">gpg --keyserver pgp.mit.edu --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3 7D2BAF1CF37B13E2069D6956105BD0E739499BDB
+\curl -sSL https://get.rvm.io | bash -s stable --ruby=2.7