I must use "scons" in version 3.0.x but in Ubuntu eoan scons is at version 3.1.x [0]. I tried to edit /etc/apt/sources.list and added
deb http://de.archive.ubuntu.com/ubuntu bionic main
After sudo apt update sudo apt list scons still only shows scons/eoan,eoan 3.1.1.-3 all
How can I install scons 3.0.x on Ubuntu Eoan?