unpaper -V failed

[Xavier74]

Hello,

I'm trying to configure ocr on alfresco community edition 5.2 with pdfsandwich, on a Debian 10 inside VM.
Everything is installed and configured, pdf OCRisation works when launched manually via command line.
But when process is started from alfresco, I get an error
at es.keensoft.alfresco.ocr.OCRExtractAction.executeImplInternal(OCRExtractAction.java:183)
at es.keensoft.alfresco.ocr.OCRExtractAction.executeImpl(OCRExtractAction.java:119)
at org.alfresco.repo.action.executer.ActionExecuterAbstractBase.execute(ActionExecuterAbstractBase.java:273)
at org.alfresco.repo.action.ActionServiceImpl.directActionExecution(ActionServiceImpl.java:856)
at org.alfresco.repo.action.executer.CompositeActionExecuter.executeImpl(CompositeActionExecuter.java:73)
at org.alfresco.repo.action.executer.ActionExecuterAbstractBase.execute(ActionExecuterAbstractBase.java:273)
at org.alfresco.repo.action.ActionServiceImpl.directActionExecution(ActionServiceImpl.java:856)
at org.alfresco.repo.action.ActionServiceImpl.executeActionImpl(ActionServiceImpl.java:757)
at org.alfresco.repo.action.AsynchronousActionExecutionQueueImpl$ActionExecutionWrapper$1$1.execute(AsynchronousActionExecutionQueueImpl.java:430)
at org.alfresco.repo.transaction.RetryingTransactionHelper.doInTransaction(RetryingTransactionHelper.java:464)
at org.alfresco.repo.transaction.RetryingTransactionHelper.doInTransaction(RetryingTransactionHelper.java:333)
at org.alfresco.repo.action.AsynchronousActionExecutionQueueImpl$ActionExecutionWrapper$1.doWork(AsynchronousActionExecutionQueueImpl.java:439)
at org.alfresco.repo.tenant.TenantUtil.runAsWork(TenantUtil.java:126)
at org.alfresco.repo.tenant.TenantUtil.runAsTenant(TenantUtil.java:95)
at org.alfresco.repo.tenant.TenantUtil$1.doWork(TenantUtil.java:69)
at org.alfresco.repo.security.authentication.AuthenticationUtil.runAs(AuthenticationUtil.java:555)
at org.alfresco.repo.tenant.TenantUtil.runAsUserTenant(TenantUtil.java:65)
at org.alfresco.repo.action.AsynchronousActionExecutionQueueImpl$ActionExecutionWrapper.run(AsynchronousActionExecutionQueueImpl.java:442)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.RuntimeException: org.alfresco.service.cmr.repository.ContentIOException: 10060569 Failed to perform OCR transformation:
Execution result:
os: Linux
command: /usr/bin/pdfsandwich -verbose -lang spa+eng+fra /opt/alfresco-community-5.2/tomcat/temp/Alfresco/OCRTransformWorker_source_6628984190029574112.pdf -o /opt/alfresco-community-5.2/tomcat/temp/Alfresco/OCRTransformWorker_source_6628984190029574112_ocr.pdf
succeeded: false
exit code: 2
out: pdfsandwich version 0.1.7
Checking for convert:
convert -version
Version: ImageMagick 7.0.5-2 Q16 x86_64 2017-04-04 http://www.imagemagick.org
Copyright: © 1999-2017 ImageMagick Studio LLC
License: http://www.imagemagick.org/script/license.php
Featur
err: unpaper: symbol lookup error: /usr/lib/x86_64-linux-gnu/libgdk_pixbuf-2.0.so.0: undefined symbol: g_bytes_unref
ERROR: Command "unpaper -V" failed.
tesseract: /opt/alfresco-community-5.2/common/lib/libtiff.so.5: no version information available (req
at es.keensoft.alfresco.ocr.OCRTransformWorker.transform(OCRTransformWorker.java:86)
at es.keensoft.alfresco.ocr.OCRExtractAction.executeImplInternal(OCRExtractAction.java:181)
... 20 more
Caused by: org.alfresco.service.cmr.repository.ContentIOException: 10060569 Failed to perform OCR transformation:
Execution result:
os: Linux
command: /usr/bin/pdfsandwich -verbose -lang spa+eng+fra /opt/alfresco-community-5.2/tomcat/temp/Alfresco/OCRTransformWorker_source_6628984190029574112.pdf -o /opt/alfresco-community-5.2/tomcat/temp/Alfresco/OCRTransformWorker_source_6628984190029574112_ocr.pdf
succeeded: false
exit code: 2
out: pdfsandwich version 0.1.7
Checking for convert:
convert -version
Version: ImageMagick 7.0.5-2 Q16 x86_64 2017-04-04 http://www.imagemagick.org
Copyright: © 1999-2017 ImageMagick Studio LLC
License: http://www.imagemagick.org/script/license.php
Featur
err: unpaper: symbol lookup error: /usr/lib/x86_64-linux-gnu/libgdk_pixbuf-2.0.so.0: undefined symbol: g_bytes_unref
ERROR: Command "unpaper -V" failed.
tesseract: /opt/alfresco-community-5.2/common/lib/libtiff.so.5: no version information available (req
at es.keensoft.alfresco.ocr.OCRTransformWorker.transform(OCRTransformWorker.java:79)
... 21 more

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Copy/past the given command on the cli with alfresco user works perfectly.

Do you have an idea on the issue ?

Many thanks in advance