Merging #PDF files on @PeppermintOS ICE or #UbuntuLinux
There are quite a few ways to merge PDFs on GNU/Linux--here's a cross-platform tool, PDFSam--but here's one I just found out about and used with my daughter while merging apps for college:
sudo apt-get install ghostscript pdftk pdfchain
The app is called PDF Chain. It works quite simply and well.