webmin-latest.sh

# wget -qO- https://goo.gl/HBY9jh | sh

wget http://www.webmin.com/download/deb/webmin-current.deb -O webmin.deb
sudo apt-get update
sudo apt-get install perl libnet-ssleay-perl libauthen-pam-perl libio-pty-perl apt-show-versions -y
sudo dpkg -i webmin.deb
sudo apt-get -f install -y
rm -rf webmin.deb

wget -qO- https://goo.gl/HBY9jh | sh

if you get

Errors were encountered while processing:
 apt-show-versions

then do as root

$ rm /etc/apt/apt.conf.d/02compress-indexes
$ apt-get update
$ dpkg -a --configure -a

and rerun the script