Say I have a 1000 page PDF document. I'm viewing something on page 100 and need to check something on page 944. Now I'm on page 944 and want to jump back to my last viewed page 100. How would I do that? From most windows pdf programms I'm used to something like Control+(<- or ->). But that doesn't seem to work in Ubuntu PDF Viewer.
I also tried combinations of Control, Shift and Alt.
Alt+p (previous) and Alt+n (next) are the shortcuts you are looking for. You can see all available keyboard combinations under the menu (tree vertical dots).