TuxCare ELS PHP installation fails in Plesk: Package 'alt-phpXY-mysql-meta' has no installation candidate, 401 Unauthorized on alt-php-els repository

Symptoms

• Installing a PHP version in Extensions > My Extensions > TuxCare Extended Lifecycle Support for PHP fails with the error:

  PLESK_ERROR: Execution packages has failed with exit code 1, stdout: Installing TuxCare ELS PHP 7.3 packages: alt-php-config alt-php73 alt-php73-cli ... alt-php73-mysql-meta
  , stderr: WARNING:__main__:Unable to download package information: Command '['apt-get', '-qq', 'update', '--allow-releaseinfo-change']' returned non-zero exit status 100.
  Trying to install requested packages using previously created cache.
  ...
  Package alt-php73-mysql-meta is not available, but is referred to by another package.
  E: Package 'alt-php73-mysql-meta' has no installation candidate
  ERROR: Failed to install alt-php73 packages

• The same error occurs for the other PHP versions.
• The TuxCare ELS PHP license is installed and the extension shows it as active.

• Updating the package lists returns 401 Unauthorized for the alt-php-els repository only:

  # apt-get update

  CONFIG_TEXT: Err:15 https://repo.alt.tuxcare.com/alt-php-els/deb/ubuntu/22.04/stable jammy InRelease
  401 Unauthorized [IP: 203.0.113.2]
  Hit:14 https://repo.alt.tuxcare.com/alt-common/deb/ubuntu/22.04/stable jammy InRelease
  E: Failed to fetch https://repo.alt.tuxcare.com/alt-php-els/deb/ubuntu/22.04/stable/dists/jammy/InRelease 401 Unauthorized
  E: The repository 'https://repo.alt.tuxcare.com/alt-php-els/deb/ubuntu/22.04/stable jammy InRelease' is not signed.

• /var/log/plesk/panel.log shows earlier attempts that failed to configure the repositories, followed by attempts that failed to install:

  CONFIG_TEXT: ERR [panel] Task failed: id=16915, type=ext-tuxcare-php-task\installconfigurephpversiontask, error=pm_Exception: Failed to configure TuxCare ELS PHP repositories.
  ERR [panel] Task failed: id=16921, type=ext-tuxcare-php-task\installconfigurephpversiontask, error=pm_Exception: Failed to install and configure TuxCare ELS PHP.

Cause

The repository authorization token saved on the server is rejected by the TuxCare ELS PHP repository. apt cannot download the package lists from it, so the TuxCare ELS PHP packages have no installation candidate.

Resolution

1. Connect to the server via SSH.

2. Re-register the server with the TuxCare ELS PHP repositories:

   # plesk ext tuxcare-php --enable

3. Make sure the alt-php-els repository is now accessible:

   # apt-get update 2>&1 | grep alt-php-els

   CONFIG_TEXT: Hit:20 https://repo.alt.tuxcare.com/alt-php-els/deb/ubuntu/22.04/stable jammy InRelease

4. Log into Plesk and go to Extensions > My Extensions > TuxCare Extended Lifecycle Support for PHP, then click Install next to the required PHP version.

5. Alternatively, you can also install the PHP versions from the command line:

   Note: Replace 7.3 with the required PHP version.

   # plesk ext tuxcare-php --install-configure -version 7.3

Note: If the command in step 2 fails with a CLN error such as "No token was returned from CLN" or "You can not register a new server", contact TuxCare support.