Comment 3 for bug 1767082

solution works for me...
https://askubuntu.com/questions/1029163/how-to-get-scilab-6-0-1-working-on-ubuntu-18-04-lts
cd ~/Downloads
wget http://http.kali.org/pool/main/libj/libjlatexmath-java/libjlatexmath-fop-java_1.0.6-1_all.deb

(just in case it fails access the link and download it...)

sudo apt-get install ./libjlatexmath-fop-java_1.0.6-1_all.deb --allow-downgrades
sudo tee /etc/apt/preferences.d/pin-jlfop >/dev/null <<EOF
Package: libjlatexmath-fop-java
Pin: version 1.0.6-1
Pin-Priority: 1337
EOF

works great...!!