I have used webmin for over a couple years on devuan.  It works fine, however, after installing webmin, you may need to configure some program paths in the modules configurations.

Edit:  You will have to first uninstall webmin completely before following the directions contained in the link above.

I want to install Webmin (1.840) like I do on all my boxes but the setup hangs after
.
.
.
** Initializing cache.
Setting up webmin (1.840) .....
nothing more after that.

Most likely it expects systemd, because I did not see this line show up during the installation process, where it does show up when I install it on Debian 8.8.

I know that Webmin used to install fine on Wheezy, and probably still does, so it should be not too hard to make this work.(?)
But I do not know all that much about Linux, but sysadmin for windows for many years does mean I can read and follow instructions.

Anyone able to give some tips or help?
That would be very much appreciated.

I really would like to be able to change all my boxes to Devuan in the near future.