https://www.virtualmin.com/documentation/installation/uninstalling
Using your DigitalOcean panel.

Thank Weot!

I uninstall like https://www.virtualmin.com/documentation/installation/uninstalling
But result:

# sh install.sh --uninstall
rpm: RPM should not be used directly install RPM packages, use Alien instead!
rpm: However assuming you know what you are doing...
error: package virtualmin-base is not installed
rpm: RPM should not be used directly install RPM packages, use Alien instead!
rpm: However assuming you know what you are doing...
error: package wbm-virtual-server is not installed
error: package wbm-virtualmin-htpasswd is not installed
error: package wbm-virtualmin-dav is not installed
error: package wbm-virtualmin-mailman is not installed
error: package wbm-virtualmin-awstats is not installed
error: package wbm-virtualmin-svn is not installed
error: package wbm-security-updates is not installed
error: package wbm-php-pear is not installed
error: package wbm-ruby-gems is not installed
error: package wbm-virtualmin-registrar is not installed
error: package wbm-virtualmin-init is not installed
rpm: RPM should not be used directly install RPM packages, use Alien instead!
rpm: However assuming you know what you are doing...
error: package wbt-virtual-server-theme is not installed
error: package ust-virtual-server-theme is not installed
error: package wbt-virtual-server-mobile is not installed
rpm: RPM should not be used directly install RPM packages, use Alien instead!
rpm: However assuming you know what you are doing...
error: package webmin is not installed
error: package usermin is not installed
error: package awstats is not installed
Done.  There's probably quite a bit of related packages and such left behind
but all of the Virtualmin-specific packages have been removed.

I not found change OS or reinstall on my DigitalOcean panel.