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cannot self-bind mount /run/snapd/ns: Permission denied ~$ hello-world internal error, please report: running “hello-world” failed: openpdf cat output test.pdf I get an error: Error: Unexpected Exception in open_reader() java.io.FileNotFoundException: 2017.pdf (Permission denied) at Change the path to PDFTK_PATH = /app/vendor/pdftk/bin/pdftk (link directly to the pdftk executable, not the bin it's in). To be 100% sure that this isn't a permissions issue, I made the /tmp folder owner and group to be www-data , which is the apache user but the same error is pdf I get an error: Error: Unexpected Exception in open_reader() java.io.FileNotFoundException: 2017.pdf (Permission denied) at gnu.java some different pdfs, also password protected, but my pdftk trick doesn't work here, it just says this: pdftk blah.pdf input_pw blah output blah2.pdf. Error: cannot change current working directory to the original directory: Permission denied. xxx@mimas:~$ sudo snap install pdftk pdftk 2.02-4 from Scott Moser