> You can use these techniques to create a virtual version of an old operating system so that you can keep using some specific software, or for a more private o

> You can use these techniques to create a virtual version of an old operating system so that you can keep using some specific software, or for a more private online environment. If kernel version is not in the way...: For command line software, I find it much easier and faster to do debootstrap and chroot with simple script that can call particular sandboxed command and return resulted output, like for exemple publican for fop based PDF conversion from docbook. I do the same for wine based games for the kids, like WOT. It has instant start, then during exit, I clean up and umount all the /proc , /dev /sys...