Advice installing PSPP on Ubuntu 20.04
Solution 1:
You can install PSPP by using its package and dependencies from 20.10.
cd ~/Downloads
wget -c http://archive.ubuntu.com/ubuntu/pool/universe/g/gsl/libgsl25_2.6+dfsg-2_amd64.deb
wget -c http://archive.ubuntu.com/ubuntu/pool/universe/g/gsl/libgslcblas0_2.6+dfsg-2_amd64.deb
wget -c http://archive.ubuntu.com/ubuntu/pool/universe/s/spread-sheet-widget/libspread-sheet-widget_0.6-3_amd64.deb
wget -c http://old-releases.ubuntu.com/ubuntu/pool/universe/p/pspp/pspp_1.4.0-3_amd64.deb
sudo apt-get install ./libgsl25_2.6+dfsg-2_amd64.deb ./libgslcblas0_2.6+dfsg-2_amd64.deb ./libspread-sheet-widget_0.6-3_amd64.deb ./pspp_1.4.0-3_amd64.deb
And then launch it from menu or with psppire
command.