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In order to help you as quickly as possible, before clicking Create Topic please provide as much of the below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:
example
Or for longer, use three backticks above and below the code snippet:
longer
example
here
Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version (eg, 20.0.5): 26.0.2
Operating system and version (eg, Ubuntu 20.04): Ubuntu 22.04.2 LTS x86_64
Apache or nginx version (eg, Apache 2.4.25): Apache/2.4.52 (Ubuntu)
PHP version (eg, 7.4): PHP 8.1.2-1ubuntu2.11 (cli) (built: Feb 22 2023 22:56:18) (NTS)
The issue you are facing:
I am trying to upgrade my nextcloud installation from version 26 to 27 via the command line but get the following output on the first line after executing this command:
sudo -u www-data php /var/www/html/nextcloud/updater/updater.phar
Nextcloud Updater - version: v26.0.0beta2-9-g64e2e4c dirty
Current version is 26.0.2.
When I select y in order to start the update I get the following error:
Check for expected files …PHP Warning: touch(): Unable to create file /mnt/nc-data/updater-oc6tun5nmw51/.step because Permission denied in phar:///var/www/html/nextcloud/updater/updater.phar/lib/Updater.php on line 1019
[✘] Check for expected files failed
Could not create .step
Update failed. To resume or retry just execute the updater again.
I cannot see how to resolve this problem as it has always upgraded flawlessly in the past.
Is this the first time you’ve seen this error? (Y/N): Yes
Steps to replicate it:
- Run the updater from the command line
- Select ‘Y’ to start the upgrade
- Receive the warning of failer above
The output of your Nextcloud log in Admin > Logging:
No logs generated specific to running the update command
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'instanceid' => '*********',
'passwordsalt' => '*********',
'secret' => '**************',
'trusted_domains' =>
array (
0 => 'localhost',
1 => '*********.co.uk',
2 => '***.***.***.5',
3 => '2a02:8010:****:****:****',
),
'datadirectory' => '/mnt/nc-data',
'dbtype' => 'pgsql',
'version' => '26.0.2.1',
'overwrite.cli.url' => 'https://*******.co.uk',
'dbname' => 'nextcloud',
'dbhost' => 'localhost:5432',
'dbport' => '',
'dbtableprefix' => 'oc_',
'dbuser' => '*****',
'dbpassword' => '**********',
'installed' => true,
'maintenance' => false,
'integrity.check.disabled' => false,
'htaccess.RewriteBase' => '/',
'activity_expire_days' => 14,
'knowledgebaseenabled' => false,
'logfile' => '/var/log/nextcloud/nextcloud.log',
'loglevel' => '2',
'logtimezone' => 'Europe/London',
'log_rotate_size' => '104857600',
'redis' =>
array (
'host' => '/var/run/redis/redis-server.sock',
'port' => 0,
'timeout' => 0.5,
'dbindex' => 1,
),
'default_phone_region' => 'GB',
'mail_smtpmode' => 'sendmail',
'mail_sendmailmode' => 'smtp',
'mail_from_address' => '*****',
'mail_domain' => '******.co.uk',
'allow_local_remote_servers' => true,
'auth.bruteforce.protection.enabled' => true,
'blacklisted_files' =>
array (
0 => '.htaccess',
1 => 'Thumbs.db',
2 => 'thumbs.db',
),
'cron_log' => true,
'defaultapp' => 'files,dashboard',
'enable_previews' => true,
'enabledPreviewProviders' =>
array (
0 => 'OC\\Preview\\PNG',
1 => 'OC\\Preview\\JPEG',
2 => 'OC\\Preview\\GIF',
3 => 'OC\\Preview\\BMP',
4 => 'OC\\Preview\\XBitmap',
5 => 'OC\\Preview\\Movie',
6 => 'OC\\Preview\\PDF',
7 => 'OC\\Preview\\MP3',
8 => 'OC\\Preview\\TXT',
9 => 'OC\\Preview\\MarkDown',
),
'filesystem_check_changes' => 0,
'filelocking.enabled' => 'true',
'maintenance_window_start' => 1,
'memcache.local' => '\\OC\\Memcache\\APCu',
'memcache.locking' => '\\OC\\Memcache\\Redis',
'overwriteprotocol' => 'https',
'preview_max_x' => 1024,
'preview_max_y' => 768,
'preview_max_scale_factor' => 1,
'profile.enabled' => false,
'quota_include_external_storage' => false,
'skeletondirectory' => '',
'trashbin_retention_obligation' => 'auto, 7',
'updater.release.channel' => 'stable',
);
The output of your Apache/nginx/system log in /var/log/____:
Nothing relevant in error.log
Nothing relevant in access.log
Output errors in nextcloud.log in /var/www/ or as admin user in top right menu, filtering for errors. Use a pastebin service if necessary.
Having cleared the nextcloud log file and run the update command, the file shows nothing.