When you’re experiencing the another update in process error, you need to delete the ‘core_updater.lock’ file from your WordPress database. The easiest way to do this is by using phpMyAdmin.
Note: Before you make changes to your database or WordPress theme files, it’s a good idea to create a full website backup. To learn more, see our guide on how to backup your WordPress site.
Launch the phpMyAdmin app, where you need to select your WordPress database. Once you click your database, it will display all of the tables inside the database.
Then, you need to click the ‘Browse’ button next to the WordPress options tables (wp_options).
This brings up all of the rows inside the options table.
You need to find the row with the option name ‘core_updater.lock’ and click on the delete button next to it.
Now, phpMyAdmin will automatically delete the row from your database.
When you go back to your WordPress website, the another update in process error will be gone, and you can continue updating your site.