Sidebar does not display on blog page, but fine with static pages

<!-- Obsolete

You have to create the file named single.php for your single post template. If you use custom post types, name the file like single-my_custom_post_type.php, where my_custom_post_type part is your registered custom post type.

Otherwise index.php is used by default.

-->

Edited:

You have to change the file name from page_blog.php to page-blog.php. Notice dash and underscore in the file name.

See Single Post display in WordPress Codex.

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