webmin install on ubuntu

First download the latest package:

wget  https://www.webmin.com/download/deb/webmin-current.deb

Install Debian package installer :
sudo apt install gdebi 

And run it (gdebi-gtk for GUI):
sudo gdebi webmin-current.deb

When install is done visit:
https://localhost:10000/

Login as root with your root password, or as any user who can use sudo

Unix tar/gzip format
https://www.webmin.com/download/webmin-current.tar.gz
RPM suitable for Redhat, Fedora, CentOS, SuSE or Mandrake Linux
https://www.webmin.com/download/rpm/webmin-current.rpm
Debian package suitable for Debian, Ubuntu or other derived Linux
https://www.webmin.com/download/deb/webmin-current.deb
Solaris package format
https://www.webmin.com/download/solaris-pkg/webmin-current.pkg.gz