Minor version upgrades

README.md

@@ -13,7 +13,7 @@
 
 ## Using the beast
 
-Course material generation and installation has been successfully tested on Ubuntu 16.04 and requires the following packages / executables to be present on your system:
+Course material generation and installation has been successfully tested on Ubuntu 22.04 and requires the following packages / executables to be present on your system:
 
 * ffmpeg
 * [Xmlmind](http://www.xmlmind.com/xmleditor)  document editor
@@ -21,7 +21,7 @@ Course material generation and installation has been successfully tested on Ubun
 * texlive-latex-base texlive-lang-german texlive-font-utils lcdf-typetools psutils ps2eps aglfn 
 * imagemagick providing convert
 * fig2dev fig2ps poppler-utils  pdf2svg libjeuclid-fop-java libfontbox-java providing fig2dev and fig2mpdf 
-* openjdk-11-jdk
+* openjdk-17-jdk
 * fop-pdf-images  from https://xmlgraphics.apache.org/fop/fop-pdf-images.html
 * /etc/fop.conf.d/jeuclid.conf
 * Scripts from bin subfolder figspecial2pdf, figspecial2png and figspecial2svg