on jammy (22.04) I got error message: Unable to load dynamic library 'facedetect.so

[William Eder]

Hi,

# lsb_release -rd
Description: Ubuntu 22.04.1 LTS
Release: 22.04

# apt-cache policy php-facedetect
php-facedetect:
  Installed: 1.1.0-19-g135c72a-2build3
  Candidate: 1.1.0-19-g135c72a-2build3
  Version table:
 *** 1.1.0-19-g135c72a-2build3 500
        500 http://hu.archive.ubuntu.com/ubuntu jammy/universe amd64 Packages
        100 /var/lib/dpkg/status

# php -v
PHP Warning: PHP Startup: Unable to load dynamic library 'facedetect.so' (tried: /usr/lib/php/20210902/facedetect.so (/usr/lib/php/20210902/facedetect.so: cannot open shared object file: No such file or directory), /usr/lib/php/20210902/facedetect.so.so (/usr/lib/php/20210902/facedetect.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
PHP 8.1.2-1ubuntu2.6 (cli) (built: Sep 15 2022 11:30:49) (NTS)
Copyright (c) The PHP Group
Zend Engine v4.1.2, Copyright (c) Zend Technologies
    with Zend OPcache v8.1.2-1ubuntu2.6, Copyright (c), by Zend Technologies

Detailed information:

Ubuntu 22.04 (jammy) with PHP 8.1, I got a warning message always when call php-cli after install php-facedetect package:

PHP Warning: PHP Startup: Unable to load dynamic library 'facedetect.so' (tried: /usr/lib/php/20210902/facedetect.so (/usr/lib/php/20210902/facedetect.so: cannot open shared object file: No such file or directory), /usr/lib/php/20210902/facedetect.so.so (/usr/lib/php/20210902/facedetect.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0

I tried to find the location of the 'facedetect.so" file but I can not found.
I checked the installer package too, but it is not contain this file as well.
I installed the package directly with command: apt-get install php-facedetect
On Ubuntu 18.04 (with PHP7.2) the php-facedetect package works perfectly.

This seems to be a packaging error.

If you compare the contents in the Ubuntu package in jammy
https://packages.ubuntu.com/jammy/amd64/php-facedetect/filelist
with the contents in Debian
https://packages.debian.org/sid/amd64/php-facedetect/filelist
or with the Ubuntu package in bionic
https://packages.ubuntu.com/bionic/amd64/php-facedetect/filelist
then you see that the facedetect.so file is missing.

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: php-facedetect 1.1.0-19-g135c72a-2build3
ProcVersionSignature: Ubuntu 5.15.0-47.51-generic 5.15.46
Uname: Linux 5.15.0-47-generic x86_64
ApportVersion: 2.20.11-0ubuntu82.1
Architecture: amd64
CasperMD5CheckResult: unknown
Date: Thu Nov 3 17:34:08 2022
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=C.UTF-8
 SHELL=/bin/bash
SourcePackage: php-facedetect
UpgradeStatus: No upgrade log present (probably fresh install)

[William Eder (pumuckly)]

A success story:
I build sources from https://github.com/infusion/PHP-Facedetect/blob/master/facedetect.cc and this can works with PHP 8.1 now (facedetect.so built and no warning messages)
It needs to install some package manually with:
apt-get install libopencv-core4.5d libopencv-highgui4.5d libopencv-imgproc4.5d libopencv-objdetect4.5d

Maybe it helps.