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It would be nice to have a program which I can use to do some drawing/sketching in a .pdf document and I can also scroll up or down.

Like this:

enter image description here

(Edited with GIMP)

It is not necessary to save the documents with the sketch.

Is there any program that can do these?

marked as duplicate by Panther, Fabby, karel, Zanna, Eric Carvalho Sep 16 '17 at 11:43

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While there is a lot of way to import and then modify a PDF under Ubuntu, you could try Master PDF Editor that provide a Linux version and even a deb version for Ubuntu.

Website here and direct DEB download link here.

Note: this is not an Open Source software and they provides commercial version with more advanced editing option. Also, I'm not affiliated with this company and I tried the software before posting here.

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