https://www.shafiq.in/tags/virtualbox/ Recent content in Virtualbox on Shafiq Alibhai Hugo en-GB 2009-2026 All rights reserved. Tue, 01 Feb 2022 09:05:56 +0000 https://www.shafiq.in/blog/how-to-resolve-cannot-unregister-the-machine-while-it-is-locked-error-in-vagrant/ Tue, 01 Feb 2022 09:05:56 +0000 https://www.shafiq.in/blog/how-to-resolve-cannot-unregister-the-machine-while-it-is-locked-error-in-vagrant/ <p>Running <code>vagrant destroy</code> sometimes fails with:</p> <div class="highlight"><pre tabindex="0" class="chroma"><code class="language-fallback" data-lang="fallback"><span class="line"><span class="cl">VBoxManage: error: Cannot unregister the machine &#39;CnC_default_1643660523119_45689&#39; while it is locked </span></span></code></pre></div><p>The VM is locked because a VirtualBox process is still holding onto it. Kill the headless process and try again:</p> <div class="highlight"><pre tabindex="0" class="chroma"><code class="language-bash" data-lang="bash"><span class="line"><span class="cl">killall -9 VBoxHeadless <span class="o">&amp;&amp;</span> vagrant destroy </span></span></code></pre></div><p><code>killall -9 VBoxHeadless</code> force-kills any running VirtualBox headless instances. The <code>&amp;&amp;</code> runs <code>vagrant destroy</code> only if that succeeds.</p>