Drupalの8.2.3へのアップグレードが

Question

に失敗した私は、Drupalの8.2.2ランニングの新規インストールを持っていたし、drushでそれを更新するhttps://www.drupal.org/node/2550801を追ったが、私は得た：

$ drush pm-update drupal 
Update information last refreshed: Fri, 11/18/2016 - 22:02 
Name Installed Version Proposed version Message     
Drupal 8.2.2    8.2.3    SECURITY UPDATE available 


Code updates will be made to drupal core. 
WARNING: Updating core will discard any modifications made to Drupal core files, most noteworthy among these are .htaccess and robots.txt. If you have made any modifications to these files, please back them up before updating so that you can re-create your modifications in the updated version of the file. 
Note: Updating core can potentially break your site. It is NOT recommended to update production sites without prior testing. 

Do you really want to continue? (y/n): y 
Drupal root path is not writable.                         [error] 
/var/www/html $ drush pm-update drupal 
Update information last refreshed: Fri, 11/18/2016 - 22:02 
Name Installed Version Proposed version Message     
Drupal 8.2.2    8.2.3    SECURITY UPDATE available 


Code updates will be made to drupal core. 
WARNING: Updating core will discard any modifications made to Drupal core files, most noteworthy among these are .htaccess and robots.txt. If you have made any modifications to these files, please back them up before updating so that you can re-create your modifications in the updated version of the file. 
Note: Updating core can potentially break your site. It is NOT recommended to update production sites without prior testing. 

Do you really want to continue? (y/n): y 
Project drupal was updated successfully. Installed version is now 8.2.3. 
Backups were saved into the directory /home/www-data/drush-backups/drupal/20161118222811/drupal.          [ok] 
[18-Nov-2016 22:28:41 UTC] Error: Call to undefined function drupal_get_installed_schema_version() in /var/www/html/core/includes/install.inc on line 80 #0 phar:///usr/local/bin/drush/commands/core/drupal/update.inc(111): drupal_load_updates() 
#1 phar:///usr/local/bin/drush/commands/core/core.drush.inc(462): update_main() 
#2 phar:///usr/local/bin/drush/includes/command.inc(422): drush_core_updatedb() 
#3 phar:///usr/local/bin/drush/includes/command.inc(231): _drush_invoke_hooks(Array, Array) 
#4 phar:///usr/local/bin/drush/includes/command.inc(199): drush_command() 
#5 phar:///usr/local/bin/drush/lib/Drush/Boot/BaseBoot.php(67): drush_dispatch(Array) 
#6 phar:///usr/local/bin/drush/includes/preflight.inc(66): Drush\Boot\BaseBoot->bootstrap_and_dispatch() 
#7 phar:///usr/local/bin/drush/includes/startup.inc(458): drush_main() 
#8 phar:///usr/local/bin/drush/includes/startup.inc(365): drush_run_main(false, '/', 'Phar detected. ...') 
#9 phar:///usr/local/bin/drush/drush(114): drush_startup(Array) 
#10 /usr/local/bin/drush(10): require('phar:///usr/loc...') 
#11 {main} 
Error: Call to undefined function drupal_get_installed_schema_version() in drupal_load_updates() (line 80 of /var/www/html/core/includes/install.inc). 
Drush command terminated abnormally due to an unrecoverable error. 

私は何かが足りないのですか？

Answer 1

drupal 8.2.2を新しいバージョン8.2.3に正常に更新しました。 最新バージョンに

$ drush pm-update drupal 
Update information last refreshed: Mon, 11/21/2016 - 12:05 
Name Installed Version Proposed version Message     
Drupal 8.2.2    8.2.3    SECURITY UPDATE available 


Code updates will be made to drupal core. 
WARNING: Updating core will discard any modifications made to Drupal core files, most noteworthy among these are .htaccess and robots.txt. If you have made any modifications to these files, please back them up before updating so that you can re-create your modifications in the updated version of the file. 
Note: Updating core can potentially break your site. It is NOT recommended to update production sites without prior testing. 

Do you really want to continue? (y/n): y 

Project drupal was updated successfully. Installed version is now 8.2.3. 
Backups were saved into the directory /home/drush-backups/d8_dbupdate_nov21/20161121110543/drupal.         [ok] 

The following updates are pending: 

system module : 
    8202 - Clear caches due to behavior change in MachineName element. 

Do you wish to run all pending updates? (y/n): y 

Performing system_update_8202                            [ok] 

Cache rebuild complete.                              [ok] 

Finished performing updates.                            [ok] 

更新drushが問題を解決するのに役立つかもしれ手順を見つけてください。

$ drush version 

Drushバージョン：8.1.7

はまた、PHPのバージョンを比較します。

Answer 2

ファイルがWebサーバーによって読み取られることを確認してください。 core/includes/schema.incが読み込み不能である可能性があります（drupal_get_installed_schema_versionが存在します）。