Pagination don't work in custom page template - wordpress

Question

I created a custom page template like category.php but I can't get the pagination working.
I just filter post from one category.
Here is my code:
<?php
/* Template Name: News */
?>
<?php get_header(); ?>
<div class="col-lg-9 col-md-8 content">
<div class="box">
<h1 class="title"><?php the_title(); ?></h1>
<div class="box-int">
<article>
<?php // Display blog posts on any page # http://m0n.co/l
$temp = $wp_query; $wp_query= null;
$wp_query = new WP_Query(); $wp_query->query('showposts=5' . '&paged='.$paged);
while ($wp_query->have_posts()) : $wp_query->the_post(); ?>
<?php
if (has_post_thumbnail()) {
the_post_thumbnail();
}
?>
<h2><?php the_title(); ?></h2>
<?php the_excerpt(); ?>
<br><br>
<?php endwhile; ?>
<?php if ($paged > 1) { ?>
<nav id="nav-posts">
<div class="prev"><?php next_posts_link('« Old'); ?></div>
<div class="next"><?php previous_posts_link('Newx »'); ?></div>
</nav>
<?php } else { ?>
<nav id="nav-posts">
<div class="prev"><?php next_posts_link('« Old'); ?></div>
</nav>
<?php } ?>
<?php wp_reset_postdata(); ?>
</article>
</div>
</div>
</div>
<div class="col-lg-3 col-md-4">
<?php get_sidebar(); ?>
</div>
<?php get_footer(); ?>
What's wrong here? I click in Page 2, but the post are always the same.

Answer 1

Your query is a bit of a mess here with some syntax errors as well.showposts died with the dinosaurs, it is long time depreciated. You should use posts_per_page. 'showposts=5' . '&paged='.$paged is also a mess. You query shouls simplify look like this
$args = array(
'posts_per_page' => 5,
'paged' => $paged
);
$query = new WP_Query( $args );
while ($query->have_posts()) : $query->the_post(); ?>
When querying the loop with WP_Query, you need to assign $max_pages parameter to the next_posts_link().
So you would need to change <?php next_posts_link('« Old'); ?> to <?php next_posts_link('« Old', $the_query->max_num_pages ); ?>
Also go and read this question on this subject. If I missed something, this question will most certainly help you out a lot.