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Update upgrade.ubuntu.18.04-20.04.html.

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en_US/upgrade/0-upgrade.ubuntu.18.04-20.04.md
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THIS IS A DRAFT DOCUMENT, DO NOT APPLY IT.
## Packages
### Upgrade iRedMail to the latest stable release first
Install required Python-2 packages:
Before upgrading server OS, it's better upgrade iRedMail to the latest stable
release first. You can find [all upgrade tutorials here](./iredmail.releases.html).
```
apt install python2-dev
pip2 install uwsgi web.py==0.51 pycurl netifaces
ln -sf /usr/local/bin/uwsgi /etc/alternatives/uwsgi
echo "SQL_DB_DRIVER = 'pymysql'" >> /opt/iredapd/settings.py
```
### Upgrade OS
If you're running OpenLDAP backend:
After you have latest iRedMail release running, it's ok to upgrade server OS
with command `do-release-upgrade` now.
```
pip2 install python-ldap
```
### Re-upgrade iRedAPD, iRedAdmin(-Pro), mlmmjadmin to the latest release
### Upgrade iRedAPD to the latest release
Please follow this tutorial to upgrade iRedAPD:
After upgraded server OS, please re-upgrade iRedAPD, iRedAdmin(-Pro) and
mlmmjadmin even you're already running the latest versions before upgrading
OS, their upgrade scripts will help fix some issues caused by OS upgrade.
- [Upgrade iRedAPD](./upgrade.iredapd.html)
### Upgrade mlmmjadmin to the latest release
Please follow this tutorial to upgrade mlmmjadmin:
- [Upgrade iRedAdmin(-Pro)](./migrate.or.upgrade.iredadmin.html)
- [Upgrade mlmmjadmin](./upgrade.mlmmjadmin.html)
## Configurations

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<div class="toc">
<ul>
<li><a href="#upgrade-ubuntu-from-1804-to-2004">Upgrade Ubuntu from 18.04 to 20.04</a><ul>
<li><a href="#packages">Packages</a><ul>
<li><a href="#upgrade-iredapd-to-the-latest-release">Upgrade iRedAPD to the latest release</a></li>
<li><a href="#upgrade-mlmmjadmin-to-the-latest-release">Upgrade mlmmjadmin to the latest release</a></li>
</ul>
</li>
<li><a href="#upgrade-iredmail-to-the-latest-stable-release-first">Upgrade iRedMail to the latest stable release first</a></li>
<li><a href="#upgrade-os">Upgrade OS</a></li>
<li><a href="#re-upgrade-iredapd-iredadmin-pro-mlmmjadmin-to-the-latest-release">Re-upgrade iRedAPD, iRedAdmin(-Pro), mlmmjadmin to the latest release</a></li>
<li><a href="#configurations">Configurations</a></li>
</ul>
</li>
@ -33,26 +31,19 @@
<p class="admonition-title">Warning</p>
<p>THIS IS A DRAFT DOCUMENT, DO NOT APPLY IT.</p>
</div>
<h2 id="packages">Packages</h2>
<p>Install required Python-2 packages:</p>
<pre><code>apt install python2-dev
pip2 install uwsgi web.py==0.51 pycurl netifaces
ln -sf /usr/local/bin/uwsgi /etc/alternatives/uwsgi
echo &quot;SQL_DB_DRIVER = 'pymysql'&quot; &gt;&gt; /opt/iredapd/settings.py
</code></pre>
<p>If you're running OpenLDAP backend:</p>
<pre><code>pip2 install python-ldap
</code></pre>
<h3 id="upgrade-iredapd-to-the-latest-release">Upgrade iRedAPD to the latest release</h3>
<p>Please follow this tutorial to upgrade iRedAPD:</p>
<h3 id="upgrade-iredmail-to-the-latest-stable-release-first">Upgrade iRedMail to the latest stable release first</h3>
<p>Before upgrading server OS, it's better upgrade iRedMail to the latest stable
release first. You can find <a href="./iredmail.releases.html">all upgrade tutorials here</a>.</p>
<h3 id="upgrade-os">Upgrade OS</h3>
<p>After you have latest iRedMail release running, it's ok to upgrade server OS
with command <code>do-release-upgrade</code> now.</p>
<h3 id="re-upgrade-iredapd-iredadmin-pro-mlmmjadmin-to-the-latest-release">Re-upgrade iRedAPD, iRedAdmin(-Pro), mlmmjadmin to the latest release</h3>
<p>After upgraded server OS, please re-upgrade iRedAPD, iRedAdmin(-Pro) and
mlmmjadmin even you're already running the latest versions before upgrading
OS, their upgrade scripts will help fix some issues caused by OS upgrade.</p>
<ul>
<li><a href="./upgrade.iredapd.html">Upgrade iRedAPD</a></li>
</ul>
<h3 id="upgrade-mlmmjadmin-to-the-latest-release">Upgrade mlmmjadmin to the latest release</h3>
<p>Please follow this tutorial to upgrade mlmmjadmin:</p>
<ul>
<li><a href="./migrate.or.upgrade.iredadmin.html">Upgrade iRedAdmin(-Pro)</a></li>
<li><a href="./upgrade.mlmmjadmin.html">Upgrade mlmmjadmin</a></li>
</ul>
<h2 id="configurations">Configurations</h2>