You can concatenate PDF files using a program called pdfjam. To install it on Ubuntu/Debian, open a terminal and run:
sudo apt-get install pdfjam
You can now concatenate as many PDF files as you wish by running:
pdfjam <file1.pdf> <file2.pdf> ... <fileN.pdf> --outfile <output-file.pdf>
This will generate a file called output-file.pdf which will be the result of joining together the input files file1.pdf, file2.pdf, ..., fileN.pdf.
If you do not get the desired page orientation on output-file.pdf, you can set it by hand by adding --landscape or --no-landscape to the end of the command above.
If you have problems with the page orientations when concatenating lots of files together, try concatenating only a few of them at a time and then concatenating the files you generated into a single document.
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