How to override module-checkout/.../cart/item/default.phtml?

you can do it using override in your module with below way,

You must have to change referencename of your xml,

First create app/code/Custom/Addprofile/view/frontend/layout/checkout_cart_index.xml,

<?xml version="1.0"?>
<page xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" layout="1column" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_configuration.xsd">
    <body>
        <referenceBlock class="Magento\Checkout\Block\Cart" name="checkout.cart.form">
            <block class="Magento\Framework\View\Element\RendererList" name="checkout.cart.item.renderers.override" as="renderer.list.custom"/>
            <arguments>
                <argument name="renderer_list_name" xsi:type="string">checkout.cart.item.renderers.override</argument>
            </arguments>
        </referenceBlock>
    </body>
</page>

Now your checkout_cart_item_renderers.xml

<?xml version="1.0"?>
<page xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_configuration.xsd">
    <body>
        <referenceBlock name="checkout.cart.item.renderers.override">
            <block class="Magento\Checkout\Block\Cart\Item\Renderer" as="default" template="Custom_Addprofile::cart/item/default.phtml" />              

            <block class="Magento\Checkout\Block\Cart\Item\Renderer" as="simple" template="Custom_Addprofile::cart/item/default.phtml" />  
        </referenceBlock>
    </body>
</page>

Finally after three days. I got it working. Below is the correct way of overriding it.

app\code\Vendor\Module\Block\Cart\AbstractCart.php

<?php

/**
 * Override cart item block in custom module
 */

namespace Vendor\Custom\Block\Cart;

class AbstractCart
{

    public function afterGetItemRenderer(\Magento\Checkout\Block\Cart\AbstractCart $subject, $result)
    {
        $result->setTemplate('Vendor_Custom::cart/item/default.phtml');
        return $result;
    }
}

app\code\Vendor\Module\etc\di.xml

<!--To override cart template--> 
    <type name="Magento\Checkout\Block\Cart\AbstractCart">
        <plugin name="cart-item-override" type="Vendor\Custom\Block\Cart\AbstractCart" sortOrder="1"/>
    </type>

app\code\Vendor\Custom\view\frontend\cart\item\default.phtml

<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */

// @codingStandardsIgnoreFile

/** @var $block \Magento\Checkout\Block\Cart\Item\Renderer */
die('template overridden');
$_item = $block->getItem();
$product = $_item->getProduct();
$isVisibleProduct = $product->isVisibleInSiteVisibility();
/** @var \Magento\Msrp\Helper\Data $helper */
$helper = $this->helper('Magento\Msrp\Helper\Data');
$canApplyMsrp = $helper->isShowBeforeOrderConfirm($product) && $helper->isMinimalPriceLessMsrp($product);
?>
<tbody class="cart item">
    <tr class="item-info">
        <td data-th="<?= $block->escapeHtml(__('Item')) ?>" class="col item">
            <?php if ($block->hasProductUrl()):?>
                <a href="<?= /* @escapeNotVerified */ $block->getProductUrl() ?>"
                   title="<?= $block->escapeHtml($block->getProductName()) ?>"
                   tabindex="-1"
                   class="product-item-photo">
            <?php else:?>
                <span class="product-item-photo">
            <?php endif;?>
            <?= $block->getImage($block->getProductForThumbnail(), 'cart_page_product_thumbnail')->toHtml() ?>
            <?php if ($block->hasProductUrl()):?>
                </a>
            <?php else: ?>
                </span>
            <?php endif; ?>
            <div class="product-item-details">
                <strong class="product-item-name">
                    <?php if ($block->hasProductUrl()):?>
                        <a href="<?= /* @escapeNotVerified */ $block->getProductUrl() ?>"><?= $block->escapeHtml($block->getProductName()) ?></a>
                    <?php else: ?>
                        <?= $block->escapeHtml($block->getProductName()) ?>
                    <?php endif; ?>
                </strong>
                <p><strong>Note: </strong>This is a renewal prodcut.</p>
                <?php if ($_options = $block->getOptionList()):?>
                    <dl class="item-options">
                        <?php foreach ($_options as $_option) : ?>
                            <?php $_formatedOptionValue = $block->getFormatedOptionValue($_option) ?>
                            <dt><?= $block->escapeHtml($_option['label']) ?></dt>
                            <dd>
                                <?php if (isset($_formatedOptionValue['full_view'])): ?>
                                    <?= /* @escapeNotVerified */ $_formatedOptionValue['full_view'] ?>
                                <?php else: ?>
                                    <?= /* @escapeNotVerified */ $_formatedOptionValue['value'] ?>
                                <?php endif; ?>
                            </dd>
                        <?php endforeach; ?>
                    </dl>
                <?php endif;?>
                <?php if ($messages = $block->getMessages()): ?>
                    <?php foreach ($messages as $message): ?>
                        <div class="cart item message <?= /* @escapeNotVerified */ $message['type'] ?>"><div><?= $block->escapeHtml($message['text']) ?></div></div>
                    <?php endforeach; ?>
                <?php endif; ?>
                <?php $addInfoBlock = $block->getProductAdditionalInformationBlock(); ?>
                <?php if ($addInfoBlock): ?>
                    <?= $addInfoBlock->setItem($_item)->toHtml() ?>
                <?php endif;?>
            </div>
        </td>

        <?php if ($canApplyMsrp): ?>
            <td class="col msrp" data-th="<?= $block->escapeHtml(__('Price')) ?>">
                <span class="pricing msrp">
                    <span class="msrp notice"><?= /* @escapeNotVerified */ __('See price before order confirmation.') ?></span>
                    <?php $helpLinkId = 'cart-msrp-help-' . $_item->getId(); ?>
                    <a href="#" class="action help map" id="<?= /* @escapeNotVerified */ ($helpLinkId) ?>" data-mage-init='{"addToCart":{"helpLinkId": "#<?= /* @escapeNotVerified */ $helpLinkId ?>","productName": "<?= /* @escapeNotVerified */ $product->getName() ?>","showAddToCart": false}}'>
                        <span><?= /* @escapeNotVerified */ __("What's this?") ?></span>
                    </a>
                </span>
            </td>
        <?php else: ?>
            <td class="col price" data-th="<?= $block->escapeHtml(__('Price')) ?>">
                <?= $block->getUnitPriceHtml($_item) ?>
            </td>
        <?php endif; ?>
        <td class="col qty" data-th="<?= $block->escapeHtml(__('Qty')) ?>">
            <div class="field qty">
                <label class="label" for="cart-<?= /* @escapeNotVerified */ $_item->getId() ?>-qty">
                    <span><?= /* @escapeNotVerified */ __('Qty') ?></span>
                </label>
                <div class="control qty">
                    <input id="cart-<?= /* @escapeNotVerified */ $_item->getId() ?>-qty"
                           name="cart[<?= /* @escapeNotVerified */ $_item->getId() ?>][qty]"
                           data-cart-item-id="<?= /* @escapeNotVerified */ $_item->getSku() ?>"
                           value="<?= /* @escapeNotVerified */ $block->getQty() ?>"
                           type="number"
                           size="4"
                           title="<?= $block->escapeHtml(__('Qty')) ?>"
                           class="input-text qty"
                           data-validate="{required:true,'validate-greater-than-zero':true}"
                           data-role="cart-item-qty"/>
                </div>
            </div>
        </td>

        <td class="col subtotal" data-th="<?= $block->escapeHtml(__('Subtotal')) ?>">
            <?php if ($canApplyMsrp): ?>
                <span class="cart msrp subtotal">--</span>
            <?php else: ?>
                <?= $block->getRowTotalHtml($_item) ?>
            <?php endif; ?>
        </td>
    </tr>
    <tr class="item-actions">
        <td colspan="100">
            <div class="actions-toolbar">
                <?= /* @escapeNotVerified */ $block->getActions($_item) ?>
            </div>
        </td>
    </tr>
</tbody>

Thanks


Here is the correct way to do an override the default.phtml.

First, you need to write sequence in module.xml. Without these sequences, you can't override.

app/code/VendorName/ModuleName/etc/module.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd">
<module name="VendorName_ModuleName" setup_version="0.0.1">
    <sequence>
        <module name="Magento_Checkout" />
        <module name="Magento_Bundle" />
        <module name="Magento_Catalog" />
        <module name="Magento_ConfigurableProduct" />
        <module name="Magento_Downloadable" />
        <module name="Magento_GroupedProduct" />
    </sequence>
</module>

On the next step you should set your template in checkout_cart_item_renderers.xml

app/code/VendorName/ModuleName/view/frontend/layout/checkout_cart_item_renderers.xml

<?xml version="1.0"?>
<page xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" layout="1column" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_configuration.xsd">
<body>

    <referenceBlock name="checkout.cart.item.renderers.bundle" template="VendorName_ModuleName::cart/item/default.phtml" />
    <referenceBlock name="checkout.cart.item.renderers.virtual" template="VendorName_ModuleName::cart/item/default.phtml" />
    <referenceBlock name="checkout.cart.item.renderers.default" template="VendorName_ModuleName::cart/item/default.phtml" />
    <referenceBlock name="checkout.cart.item.renderers.simple" template="VendorName_ModuleName::cart/item/default.phtml" />
    <referenceBlock name="checkout.cart.item.renderers.configurable" template="VendorName_ModuleName::cart/item/default.phtml" />
    <referenceBlock name="checkout.cart.item.renderers.grouped" template="VendorName_ModuleName::cart/item/default.phtml" />

</body>
</page>

And last step it is your template which should be in this path.

app/code/VendorName/ModuleName/view/frontend/templates/cart/item/default.phtml

Enjoy!