- Plesk Onyx for Linux
- OS version is Ubuntu 16.04 with 17.5 or Ubuntu 18 with Plesk 17.8;
- Installation of the extension Softaculous Auto Installer fails with the following error:
PLESK_ERROR: Installation of extension has failed
- Execution of /opt/psa/tmp/moduleWHy2lH/plib/scripts/pre-install.php failed with exit code 1 and the output:
- ionCube Loader is not loaded. Please enable it to continue installation
This is a Plesk bug #PPPM-9045 (Ubuntu 16) and #PPPM-10236 (Ubuntu 18).
PPPM-10236 has been fixed in Plesk Obsidian
For Ubuntu 18 upgrade to the latest Plesk version How to upgrade Plesk to the next release.
For Ubuntu 16, as a workaround apply the solution from the article How to install ionCube Loader in Ubuntu 16.04/18.04