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&lt;p&gt;Pressing Ctrl+Alt+Backspace on my keyboard restarts the X server, losing all my work.&lt;/p&gt;
&lt;p&gt;Reason is that the package &lt;tt class="docutils literal"&gt;&lt;span class="pre"&gt;ubuntu-mate-default-settings&lt;/span&gt;&lt;/tt&gt; ships a file &lt;tt class="docutils literal"&gt;&lt;span class="pre"&gt;/usr/share/X11/xorg.conf.d/90-zap.conf&lt;/span&gt;&lt;/tt&gt;, which sets this setting.&lt;/p&gt;
&lt;p&gt;Bug report: &lt;a class="reference external" href="https://bugs.launchpad.net/ubuntu-mate/+bug/1515968"&gt;https://bugs.launchpad.net/ubuntu-mate/+bug/1515968&lt;/a&gt;&lt;/p&gt;
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&lt;/pre&gt;&lt;/td&gt;&lt;td class="de1"&gt;&lt;pre class="de1"&gt;Section &lt;span class="st0"&gt;&amp;quot;ServerFlags&amp;quot;&lt;/span&gt;
&amp;#160; &amp;#160; Option &lt;span class="st0"&gt;&amp;quot;DontZap&amp;quot;&lt;/span&gt; &amp;#160;&lt;span class="st0"&gt;&amp;quot;true&amp;quot;&lt;/span&gt;
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&lt;/pre&gt;&lt;/td&gt;&lt;td class="de1"&gt;&lt;pre class="de1"&gt;Section &lt;span class="st0"&gt;&amp;quot;InputClass&amp;quot;&lt;/span&gt;
&amp;#160; &amp;#160; Identifier &lt;span class="st0"&gt;&amp;quot;keyboard defaults&amp;quot;&lt;/span&gt;
&amp;#160; &amp;#160; MatchIsKeyboard &lt;span class="st0"&gt;&amp;quot;on&amp;quot;&lt;/span&gt;
&amp;#160;
&amp;#160; &amp;#160; Option &lt;span class="st0"&gt;&amp;quot;XKbOptions&amp;quot;&lt;/span&gt; &lt;span class="st0"&gt;&amp;quot;terminate:ctrl_alt_bksp&amp;quot;&lt;/span&gt;
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