on my Linux Mint 18.1 system your install command did not work
Code:
mkdir calibre-beta && tar -C calibre-beta xvf /path/to/downloaded/tarball.tar.xz
Error
Code:
tar: You must specify one of the '-Acdtrux', '--delete' or '--test-label' options
Try 'tar --help' or 'tar --usage' for more information.
I used this instead:
Code:
mkdir calibre-beta && tar xvf /path/to/downloaded/tarball.tar.xz -C /home/username/calibre-beta
Running the server on linux and assessing from windows 10 firefox only problems are as noted , plus not seeing virtual libraries.
bernie