How to Switch / Change / Downgrade from PHP 7.2 to 7.1 on Ubuntu 16.04 / 18.04 , Apache | PHP

Follow following steps

1. sudo add-apt-repository ppa:ondrej/php
2. sudo apt-get update
3. sudo apt-get install php7.1
4. sudo apt-get install php7.1-cli php7.1-common php7.1-json php7.1-opcache php7.1-mysql php7.1-mbstring php7.1-mcrypt php7.1-zip php7.1-fpm
5. sudo a2dismod php7.2
6. sudo a2enmod php7.1
7. systemctl restart apache2
8. sudo rm /usr/bin/php
9. sudo ln -s /usr/bin/php7.1 /usr/bin/php

How to change the sort order for shipping in admin panel in magento

Step 1 : You have to copy this two files to your Theme in the adminhtml

app/design/adminhtml/default/default/template/sales/order/shipment/create/tracking.phtml
app/design/adminhtml/default/default/template/sales/order/invoice/create/tracking.phtml

Step 2 : Open : app/design/adminhtml/default/default/template/sales/order/shipment/create/tracking.phtml
(you will find this code at Line number 93)

Replace with

<select name="tracking[__index__][carrier_code]" id="trackingC__index__" class="select carrier" style="width:110px;" disabled="disabled">
    <?php foreach ($this->getCarriers() as $_code=>$_name): ?>
    <option value="<?php echo $_code ?>"><?php echo $this->escapeHtml($_name) ?></option>
    <?php endforeach; ?>
</select>

Step 3 : Open : app/design/adminhtml/default/default/template/sales/order/invoice/create/tracking.phtml
(you will find this code at Line number 93)

Replace with

<select name="tracking[__index__][carrier_code]" id="trackingC__index__" class="select carrier" style="width:110px;" disabled="disabled">
    <?php foreach ($this->getCarriers() as $_code=>$_name): ?>
    <option <?php if ($_code=="ups"): ?>selected<?php endif; ?> value="<?php echo $_code ?>"><?php echo $this->escapeHtml($_name) ?></option>
    <?php endforeach; ?>
</select>