In my case, the problem was caused by the removed permissions for my "administrators" user group.
More exactly the `update_core` were missing in `wp_options` table `option_name = %wp-table-prefix%_wp_user_roles`
The easiest way to fix it is to install [PublishPress Capabilities][1] plugin and you can find it in the "Admin" tab. First, click black X (negate all) and save and then you can enable it.
The same maybe for plugins and themes updates.

[1]: https://wordpress.org/plugins/capability-manager-enhanced/

In my case, the problem was caused by the removed permissions for my "administrators" user group.
More exactly the `update_core` were missing in `wp_options` table `option_name = %wp-table-prefix%_wp_user_roles`
The easiest way to fix it is to install [PublishPress Capabilities][1] plugin and you can find it in the "Admin" tab. First, click black X (negate all) and save and then you can enable it.
The same maybe for plugins and themes updates.

[1]: https://wordpress.org/plugins/capability-manager-enhanced/