To install the latest version of Xournal (currently 0.4. for Ubuntu releases 14.04, 13.10, 12.04, go to the Terminal and type
- sudo add-apt-repository ppa:nilarimogard/webupd8
- sudo apt-get update
- sudo apt-get install xournal
To install Xournal (current version, 1:0.4.8-1) for Ubuntu Linux 16.04, type
- sudo apt-get update
- sudo apt-get install xournal
See more ways to install Xournal on Ubuntu: http://xournal.sourceforge.net/