PDF Arranger
Merges, splits, rotates and reorders pages in PDF files.
Installs from Ubuntu's own software archive.
Looking for Adobe Acrobat on Linux? PDF Arranger does the same job for free, and TuxPick installs it for you.
Install PDF Arranger with TuxPickIt works on Ubuntu 22.04 and 24.04, and on systems built on them like Zorin OS and Pop!_OS.