Can't update drupal core to 7.27

Question

I'm tring to update using drush, with the command drush up, but core is not updating. it says on the drush output:

Project drupal was updated successfully. Installed version is now 7.27.

but it's not! the status report clearly says the version is still 7.26. Also, I tried running drush again, and it updates successfully from 26 to 27 every time I run it...

UPDATE

I did this command:

drush up drupal -v

and this was the output:

Initialized Drupal 7.26 root directory at /www/permalink.hashworld.co/docs                                                                                                               

    [notice]
Initialized Drupal site default at sites/default                                                                                                                                             [notice]
Loading release_info engine.                                                                                                                                                                 [notice]
Loading version_control engine.                                                                                                                                                              [notice]
Loading package_handler engine.                                                                                                                                                              [notice]
Executing: wget --version
/usr/bin/php  -d magic_quotes_gpc=Off -d magic_quotes_runtime=Off -d magic_quotes_sybase=Off /usr/share/php/drush/drush.php --php=/usr/bin/php --php-options=' -d magic_quotes_gpc=Off -d    [notice]
magic_quotes_runtime=Off -d magic_quotes_sybase=Off'  --backend=2 --verbose --root=/www/permalink.hashworld.co/docs --uri=http://default  pm-updatestatus drupal 2>&1
 Name    Installed Version  Proposed version  Message
 Drupal  7.26               7.27              SECURITY UPDATE available


Update information last refreshed: Fri, 04/18/2014 - 20:06
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
Executing: svn info /www/permalink.hashworld.co/docs/drupal-7.27
Executing: bzr root /www/permalink.hashworld.co/docs/drupal-7.27
Executing: wget --version
Executing: wget -q --timeout=30 -O /tmp/download_fileN0AtzR http://ftp.drupal.org/files/projects/drupal-7.27.tar.gz
Downloading drupal-7.27.tar.gz was successful.                                                                                                                                               [notice]
Md5 checksum of drupal-7.27.tar.gz verified.                                                                                                                                                 [notice]
Mime type for /www/permalink.hashworld.co/docs/drupal-7.27.tar.gz is application/x-gzip                                                                                                      [notice]
Executing: tar -C /www/permalink.hashworld.co/docs -xzf drupal-7.27.tar.gz
Executing: tar -tzf drupal-7.27.tar.gz
Project drupal was updated successfully. Installed version is now 7.27.
Backups were saved into the directory /home/ubuntu/drush-backups/permalink/20140421094219/drupal.                                                                                         [ok]
Command dispatch complete                                                                                                                                                                    [notice]
/usr/bin/php  -d magic_quotes_gpc=Off -d magic_quotes_runtime=Off -d magic_quotes_sybase=Off /usr/share/php/drush/drush.php --php=/usr/bin/php --php-options=' -d magic_quotes_gpc=Off -d    [notice]
magic_quotes_runtime=Off -d magic_quotes_sybase=Off'  --backend=2 --verbose --root=/www/permalink.hashworld.co/docs --uri=http://default  updatedb 2>&1
Initialized Drupal 7.26 root directory at /www/permalink.hashworld.co/docs                                                                                                                   [notice]
Initialized Drupal site default at sites/default                                                                                                                                             [notice]
No database updates required                                                                                                                                                              [success]
/usr/bin/php  -d magic_quotes_gpc=Off -d magic_quotes_runtime=Off -d magic_quotes_sybase=Off /usr/share/php/drush/drush.php --php=/usr/bin/php --php-options=' -d magic_quotes_gpc=Off -d    [notice]
magic_quotes_runtime=Off -d magic_quotes_sybase=Off'  --backend=2 --verbose --yes --root=/www/permalink.hashworld.co/docs --uri=http://default  cache-clear all 2>&1
Initialized Drupal 7.26 root directory at /www/permalink.hashworld.co/docs                                                                                                                   [notice]
Initialized Drupal site default at sites/default                                                                                                                                             [notice]
'all' cache was cleared.                                                                                                                                                                  [success]
Command dispatch complete                                                                                                                                                                    [notice]
Finished performing updates.                                                                                                                                                              [ok]
Command dispatch complete                                                                                                                                                                    [notice]
Command dispatch complete   

Answer 1

It might be issue with permissions of Drupal root directory.. Try running them as sudo

sudo drush up

Above command updates all enabled modules and core in Drupal...

Try using

sudo drush up drupal

which updates only core.. It worked for me.. I Updated from 7.22 to latest 7.27..

Try with -v for more information..

sudo drush up drupal -v

To debug use below command with --debug option

sudo drush up drupal --debug

Answer 2

Update drush to the last stable versión an try again.

If it doesn't work do it manually: (this is tedious but not hard);

1. Make a backup of your Drupal instance. (For ex: with MySQL)
2. Download the latest release of your current Drupal version.
3. Extract the [tar ball or zip] Drupal package.
4. Set your site on maintenance mode (For ex: How on D7)
5. Delete all the files & folders inside your original Drupal instance except for /sites folder and any custom files youmadded elsewhere.
6. Copy all the folders and files except /sites from inside the extracted Drupal package [tar ball or zip package] into your original Drupal instance.
7. If the update release includes changes to settings.php replace old settings.php in .../sites/default/ with the new one, and edit site-specific entries (eg database name, user, and password)
8. If you modified files such as .htaccess or robots.txt re-apply those changes to the new files.
9. Login to your site as administrator or as user no 1 Run update.php by navigating to /update.php
   1. Follow the process to update your Drupal instance Disable maintenance mode.

more info