[Solved] Indexing works, but not for pdf files

After migration Seafile Pro 6.0.0.9 from Archlinux to ubuntu-server file-indexings works, but not for pdf files.

i tried to run serval times ./pro.py search --clear and pro.py --update und remove old indexing files rm -rf pro-data/search as descript in the manual.

Indexing from other office files like .docx and .xlsx works as expected. If i add a new pdf file to a repo and ./pro.py --update the following output is showing:

The maybe important part:
12/06/2023 07:11:21 [DEBUG] seafes:92 update_repo: Repo 1ca34f72-c685-44cc-ba93-0cb10789623b already uptodate
timeout: failed to run command ‘pdftotext’: No such file or directory

Full output:
./pro.py search --update

Updating search index, this may take a while...

12/06/2023 07:11:19 [INFO] seafes:210 main: storage: using filesystem storage backend
12/06/2023 07:11:19 [INFO] seafes:212 main: index office pdf: True
12/06/2023 07:11:19 [INFO] elastic_transport.transport:336 perform_request: HEAD http://127.0.0.1:9200/repo_head [status:200 duration:0.003s]
12/06/2023 07:11:19 [INFO] elastic_transport.transport:336 perform_request: HEAD http://127.0.0.1:9200/repofiles [status:200 duration:0.002s]
12/06/2023 07:11:19 [INFO] seafes:161 start_index_local: Index process initialized.
12/06/2023 07:11:19 [INFO] seafes:45 run: starting worker0 worker threads for indexing
12/06/2023 07:11:19 [INFO] seafes:45 run: starting worker1 worker threads for indexing
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: GET http://127.0.0.1:9200/repo_head/_doc/3472a49f-dcc5-4d36-9008-33c79a8e9900 [status:200 duration:0.005s]
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: GET http://127.0.0.1:9200/repo_head/_doc/52e90a69-86fd-40ed-88ba-1905f0071d27 [status:200 duration:0.004s]
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: GET http://127.0.0.1:9200/repo_head/_doc/3472a49f-dcc5-4d36-9008-33c79a8e9900 [status:200 duration:0.002s]
12/06/2023 07:11:21 [DEBUG] seafes:92 update_repo: Repo 3472a49f-dcc5-4d36-9008-33c79a8e9900 already uptodate
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: GET http://127.0.0.1:9200/repo_head/_doc/6529a6e2-1309-47a2-a395-237d90d236aa [status:200 duration:0.001s]
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: GET http://127.0.0.1:9200/repo_head/_doc/52e90a69-86fd-40ed-88ba-1905f0071d27 [status:200 duration:0.002s]
12/06/2023 07:11:21 [DEBUG] seafes:92 update_repo: Repo 52e90a69-86fd-40ed-88ba-1905f0071d27 already uptodate
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: GET http://127.0.0.1:9200/repo_head/_doc/6529a6e2-1309-47a2-a395-237d90d236aa [status:200 duration:0.001s]
12/06/2023 07:11:21 [DEBUG] seafes:92 update_repo: Repo 6529a6e2-1309-47a2-a395-237d90d236aa already uptodate
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: GET http://127.0.0.1:9200/repo_head/_doc/694810c5-c1eb-4a97-ab11-9504acfa365e [status:200 duration:0.002s]
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: GET http://127.0.0.1:9200/repo_head/_doc/817c12d9-f068-4459-bd05-19675ddf212d [status:200 duration:0.002s]
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: GET http://127.0.0.1:9200/repo_head/_doc/817c12d9-f068-4459-bd05-19675ddf212d [status:200 duration:0.002s]
12/06/2023 07:11:21 [DEBUG] seafes:92 update_repo: Repo 817c12d9-f068-4459-bd05-19675ddf212d already uptodate
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: GET http://127.0.0.1:9200/repo_head/_doc/694810c5-c1eb-4a97-ab11-9504acfa365e [status:200 duration:0.004s]
12/06/2023 07:11:21 [DEBUG] seafes:92 update_repo: Repo 694810c5-c1eb-4a97-ab11-9504acfa365e already uptodate
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: GET http://127.0.0.1:9200/repo_head/_doc/883a0bce-301c-41e8-808b-9ca78646b05c [status:200 duration:0.002s]
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: GET http://127.0.0.1:9200/repo_head/_doc/99e370f9-8cac-4dcf-84d8-a6385da94b7d [status:200 duration:0.004s]
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: GET http://127.0.0.1:9200/repo_head/_doc/883a0bce-301c-41e8-808b-9ca78646b05c [status:200 duration:0.003s]
12/06/2023 07:11:21 [DEBUG] seafes:92 update_repo: Repo 883a0bce-301c-41e8-808b-9ca78646b05c already uptodate
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: GET http://127.0.0.1:9200/repo_head/_doc/aa219e9b-ff71-4638-bbe6-24a01732b101 [status:200 duration:0.001s]
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: GET http://127.0.0.1:9200/repo_head/_doc/99e370f9-8cac-4dcf-84d8-a6385da94b7d [status:200 duration:0.003s]
12/06/2023 07:11:21 [DEBUG] seafes:92 update_repo: Repo 99e370f9-8cac-4dcf-84d8-a6385da94b7d already uptodate
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: GET http://127.0.0.1:9200/repo_head/_doc/aa219e9b-ff71-4638-bbe6-24a01732b101 [status:200 duration:0.002s]
12/06/2023 07:11:21 [DEBUG] seafes:92 update_repo: Repo aa219e9b-ff71-4638-bbe6-24a01732b101 already uptodate
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: GET http://127.0.0.1:9200/repo_head/_doc/d274f7b1-7c29-4635-851c-6824d5542c83 [status:200 duration:0.002s]
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: GET http://127.0.0.1:9200/repo_head/_doc/e2ce310c-bd4a-435d-b72d-018e70e1af84 [status:200 duration:0.002s]
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: GET http://127.0.0.1:9200/repo_head/_doc/d274f7b1-7c29-4635-851c-6824d5542c83 [status:200 duration:0.002s]
12/06/2023 07:11:21 [INFO] seafes:83 update_repo: Updating repo d274f7b1-7c29-4635-851c-6824d5542c83
12/06/2023 07:11:21 [DEBUG] seafes:84 update_repo: latest_commit_id: 11b70e6c0314f5963dbdcce58330791adbfbc1c9, status.from_commit: 0702f4f5eb14e6a6c5182b3ce399b288f1cbbfeb
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: GET http://127.0.0.1:9200/repo_head/_doc/e2ce310c-bd4a-435d-b72d-018e70e1af84 [status:200 duration:0.003s]
12/06/2023 07:11:21 [DEBUG] seafes:92 update_repo: Repo e2ce310c-bd4a-435d-b72d-018e70e1af84 already uptodate
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: GET http://127.0.0.1:9200/repo_head/_doc/e48fc405-8a3b-4f34-b99b-5d4c0a4e89bb [status:200 duration:0.001s]
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: GET http://127.0.0.1:9200/repo_head/_doc/e48fc405-8a3b-4f34-b99b-5d4c0a4e89bb [status:200 duration:0.006s]
12/06/2023 07:11:21 [DEBUG] seafes:92 update_repo: Repo e48fc405-8a3b-4f34-b99b-5d4c0a4e89bb already uptodate
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: GET http://127.0.0.1:9200/repo_head/_doc/8e353075-71ae-4475-8c5b-9705de83f7a7 [status:200 duration:0.001s]
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: GET http://127.0.0.1:9200/repo_head/_doc/8e353075-71ae-4475-8c5b-9705de83f7a7 [status:200 duration:0.001s]
12/06/2023 07:11:21 [DEBUG] seafes:92 update_repo: Repo 8e353075-71ae-4475-8c5b-9705de83f7a7 already uptodate
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: GET http://127.0.0.1:9200/repo_head/_doc/8ebe0cbf-6ff4-4178-b57f-f628b07a08d5 [status:200 duration:0.001s]
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: GET http://127.0.0.1:9200/repo_head/_doc/8ebe0cbf-6ff4-4178-b57f-f628b07a08d5 [status:200 duration:0.001s]
12/06/2023 07:11:21 [DEBUG] seafes:92 update_repo: Repo 8ebe0cbf-6ff4-4178-b57f-f628b07a08d5 already uptodate
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: GET http://127.0.0.1:9200/repo_head/_doc/d059361c-7cd5-4f60-b7c6-d7cc5cb8b5eb [status:200 duration:0.001s]
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: GET http://127.0.0.1:9200/repo_head/_doc/d059361c-7cd5-4f60-b7c6-d7cc5cb8b5eb [status:200 duration:0.001s]
12/06/2023 07:11:21 [DEBUG] seafes:92 update_repo: Repo d059361c-7cd5-4f60-b7c6-d7cc5cb8b5eb already uptodate
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: GET http://127.0.0.1:9200/repo_head/_doc/ce9356d5-20c5-416b-9439-e479733bb600 [status:200 duration:0.001s]
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: GET http://127.0.0.1:9200/repo_head/_doc/ce9356d5-20c5-416b-9439-e479733bb600 [status:200 duration:0.001s]
12/06/2023 07:11:21 [DEBUG] seafes:92 update_repo: Repo ce9356d5-20c5-416b-9439-e479733bb600 already uptodate
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: GET http://127.0.0.1:9200/repo_head/_doc/0f8eae05-bef8-494d-bc5c-b61e1609e14e [status:200 duration:0.001s]
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: POST http://127.0.0.1:9200/repo_head/_update/d274f7b1-7c29-4635-851c-6824d5542c83 [status:200 duration:0.027s]
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: GET http://127.0.0.1:9200/repo_head/_doc/0f8eae05-bef8-494d-bc5c-b61e1609e14e [status:200 duration:0.010s]
12/06/2023 07:11:21 [DEBUG] seafes:92 update_repo: Repo 0f8eae05-bef8-494d-bc5c-b61e1609e14e already uptodate
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: GET http://127.0.0.1:9200/repo_head/_doc/02ef2d6d-c18b-48d9-94d1-46bf9d61f938 [status:200 duration:0.002s]
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: GET http://127.0.0.1:9200/repo_head/_doc/02ef2d6d-c18b-48d9-94d1-46bf9d61f938 [status:200 duration:0.002s]
12/06/2023 07:11:21 [DEBUG] seafes:92 update_repo: Repo 02ef2d6d-c18b-48d9-94d1-46bf9d61f938 already uptodate
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: POST http://127.0.0.1:9200/repo_head/_refresh [status:200 duration:0.015s]
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: GET http://127.0.0.1:9200/repo_head/_doc/0f7d71cf-4a49-4f26-8f9c-114562df565a [status:200 duration:0.003s]
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: GET http://127.0.0.1:9200/repo_head/_doc/0f7d71cf-4a49-4f26-8f9c-114562df565a [status:200 duration:0.004s]
12/06/2023 07:11:21 [DEBUG] seafes:92 update_repo: Repo 0f7d71cf-4a49-4f26-8f9c-114562df565a already uptodate
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: GET http://127.0.0.1:9200/repo_head/_doc/9c11996a-cb40-4960-941c-b4eb8700ccb9 [status:200 duration:0.002s]
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: GET http://127.0.0.1:9200/repo_head/_doc/9c11996a-cb40-4960-941c-b4eb8700ccb9 [status:200 duration:0.001s]
12/06/2023 07:11:21 [DEBUG] seafes:92 update_repo: Repo 9c11996a-cb40-4960-941c-b4eb8700ccb9 already uptodate
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: GET http://127.0.0.1:9200/repo_head/_doc/88ba8422-38be-4671-ab26-bfb5891d2e2e [status:200 duration:0.002s]
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: GET http://127.0.0.1:9200/repo_head/_doc/88ba8422-38be-4671-ab26-bfb5891d2e2e [status:200 duration:0.001s]
12/06/2023 07:11:21 [DEBUG] seafes:92 update_repo: Repo 88ba8422-38be-4671-ab26-bfb5891d2e2e already uptodate
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: GET http://127.0.0.1:9200/repo_head/_doc/4cc1d27a-382f-4030-9899-00993bb839cf [status:200 duration:0.002s]
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: GET http://127.0.0.1:9200/repo_head/_doc/4cc1d27a-382f-4030-9899-00993bb839cf [status:200 duration:0.001s]
12/06/2023 07:11:21 [DEBUG] seafes:92 update_repo: Repo 4cc1d27a-382f-4030-9899-00993bb839cf already uptodate
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: GET http://127.0.0.1:9200/repo_head/_doc/1ca34f72-c685-44cc-ba93-0cb10789623b [status:200 duration:0.001s]
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: PUT http://127.0.0.1:9200/repofiles/_doc/d274f7b1-7c29-4635-851c-6824d5542c83%2F [status:200 duration:0.016s]
12/06/2023 07:11:21 [INFO] seafes:181 extract: extracting d274f7b1-7c29-4635-851c-6824d5542c83 /fortigate-100f-series.pdf...
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: GET http://127.0.0.1:9200/repo_head/_doc/1ca34f72-c685-44cc-ba93-0cb10789623b [status:200 duration:0.010s]
12/06/2023 07:11:21 [DEBUG] seafes:92 update_repo: Repo 1ca34f72-c685-44cc-ba93-0cb10789623b already uptodate
timeout: failed to run command ‘pdftotext’: No such file or directory
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: GET http://127.0.0.1:9200/repo_head/_doc/efe4026f-f035-4f7a-8d97-a96b0c4f84f3 [status:200 duration:0.003s]
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: GET http://127.0.0.1:9200/repo_head/_doc/efe4026f-f035-4f7a-8d97-a96b0c4f84f3 [status:200 duration:0.002s]
12/06/2023 07:11:21 [DEBUG] seafes:92 update_repo: Repo efe4026f-f035-4f7a-8d97-a96b0c4f84f3 already uptodate
12/06/2023 07:11:21 [INFO] seafes:183 extract: successfully extracted /fortigate-100f-series.pdf
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: GET http://127.0.0.1:9200/repo_head/_doc/552423cd-ab49-49b0-97dd-51d476718a39 [status:200 duration:0.004s]
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: GET http://127.0.0.1:9200/repofiles/_doc/d274f7b1-7c29-4635-851c-6824d5542c83%2Ffortigate-100f-series.pdf?_source_includes= [status:404 duration:0.002s]
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: GET http://127.0.0.1:9200/repo_head/_doc/552423cd-ab49-49b0-97dd-51d476718a39 [status:200 duration:0.003s]
12/06/2023 07:11:21 [DEBUG] seafes:92 update_repo: Repo 552423cd-ab49-49b0-97dd-51d476718a39 already uptodate
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: GET http://127.0.0.1:9200/repo_head/_doc/8cf22a4b-ac3f-4008-9099-4ac48bdc00a8 [status:200 duration:0.002s]
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: GET http://127.0.0.1:9200/repo_head/_doc/8cf22a4b-ac3f-4008-9099-4ac48bdc00a8 [status:200 duration:0.001s]
12/06/2023 07:11:21 [DEBUG] seafes:92 update_repo: Repo 8cf22a4b-ac3f-4008-9099-4ac48bdc00a8 already uptodate
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: GET http://127.0.0.1:9200/repo_head/_doc/7a274fbc-26c7-427b-9063-f6bd624e3f6f [status:200 duration:0.002s]
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: GET http://127.0.0.1:9200/repo_head/_doc/7a274fbc-26c7-427b-9063-f6bd624e3f6f [status:200 duration:0.002s]
12/06/2023 07:11:21 [DEBUG] seafes:92 update_repo: Repo 7a274fbc-26c7-427b-9063-f6bd624e3f6f already uptodate
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: GET http://127.0.0.1:9200/repo_head/_doc/6b66efa9-787a-4fb0-a2b1-0bcdc33080e4 [status:200 duration:0.002s]
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: GET http://127.0.0.1:9200/repo_head/_doc/6b66efa9-787a-4fb0-a2b1-0bcdc33080e4 [status:200 duration:0.002s]
12/06/2023 07:11:21 [DEBUG] seafes:92 update_repo: Repo 6b66efa9-787a-4fb0-a2b1-0bcdc33080e4 already uptodate
/opt/seafile/seafile-pro-server-10.0.9/pro/python/seafes/index_local.py:96: DeprecationWarning: currentThread() is deprecated, use current_thread() instead
  % (threading.currentThread().getName())
/opt/seafile/seafile-pro-server-10.0.9/pro/python/seafes/index_local.py:96: DeprecationWarning: getName() is deprecated, get the name attribute instead
  % (threading.currentThread().getName())
12/06/2023 07:11:21 [DEBUG] seafes:94 thread_task: Queue is empty, worker0 worker threads stop
/opt/seafile/seafile-pro-server-10.0.9/pro/python/seafes/index_local.py:121: DeprecationWarning: currentThread() is deprecated, use current_thread() instead
  % (threading.currentThread().getName(),
/opt/seafile/seafile-pro-server-10.0.9/pro/python/seafes/index_local.py:121: DeprecationWarning: getName() is deprecated, get the name attribute instead
  % (threading.currentThread().getName(),
12/06/2023 07:11:21 [INFO] seafes:119 thread_task: worker0 worker updated at 2023-12-06 07:11 time
/opt/seafile/seafile-pro-server-10.0.9/pro/python/seafes/index_local.py:126: DeprecationWarning: currentThread() is deprecated, use current_thread() instead
  % (threading.currentThread().getName(),
/opt/seafile/seafile-pro-server-10.0.9/pro/python/seafes/index_local.py:126: DeprecationWarning: getName() is deprecated, get the name attribute instead
  % (threading.currentThread().getName(),
12/06/2023 07:11:21 [INFO] seafes:124 thread_task: worker0 worker get 0 error
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: PUT http://127.0.0.1:9200/repofiles/_doc/d274f7b1-7c29-4635-851c-6824d5542c83%2Ffortigate-100f-series.pdf [status:201 duration:0.023s]
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: POST http://127.0.0.1:9200/repofiles/_refresh [status:200 duration:0.022s]
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: POST http://127.0.0.1:9200/repofiles/_refresh [status:200 duration:0.002s]
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: POST http://127.0.0.1:9200/repo_head/_update/d274f7b1-7c29-4635-851c-6824d5542c83 [status:200 duration:0.007s]
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: POST http://127.0.0.1:9200/repo_head/_refresh [status:200 duration:0.014s]
12/06/2023 07:11:21 [DEBUG] seafes:94 thread_task: Queue is empty, worker1 worker threads stop
12/06/2023 07:11:21 [INFO] seafes:119 thread_task: worker1 worker updated at 2023-12-06 07:11 time
12/06/2023 07:11:21 [INFO] seafes:124 thread_task: worker1 worker get 0 error
12/06/2023 07:11:21 [INFO] seafes:38 clear_worker: All worker threads has stopped.
12/06/2023 07:11:21 [INFO] seafes:72 run: index updated, total time 2.1835060119628906 seconds
12/06/2023 07:11:21 [INFO] seafes:131 clear_deleted_repo: start to clear deleted repo
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: POST http://127.0.0.1:9200/repo_head/_search?scroll=5m [status:200 duration:0.006s]
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: POST http://127.0.0.1:9200/_search/scroll [status:200 duration:0.002s]
12/06/2023 07:11:21 [INFO] elastic_transport.transport:336 perform_request: DELETE http://127.0.0.1:9200/_search/scroll [status:200 duration:0.001s]
12/06/2023 07:11:21 [INFO] seafes:135 clear_deleted_repo: 0 repos need to be deleted.
12/06/2023 07:11:21 [INFO] seafes:139 clear_deleted_repo: deleted repo has been cleared
12/06/2023 07:11:21 [INFO] seafes:164 start_index_local:

Index updated, statistic report:

12/06/2023 07:11:21 [INFO] seafes:165 start_index_local: [commit read] 2
12/06/2023 07:11:21 [INFO] seafes:166 start_index_local: [dir read]    2
12/06/2023 07:11:21 [INFO] seafes:167 start_index_local: [file read]   1
12/06/2023 07:11:21 [INFO] seafes:168 start_index_local: [block read]  1
seafile@seafile:/opt/seafile/seafile-server-latest/pro$

Solving by installing apt install poppler-utils.
Poppler-utils ist not in the list of the dependencies. For Seafile 8.0.x and 9.0.x it is in the list.
@daniel.pan please update the list in the admin manual

Hello, the manual has been updated.