Because of the inclusion of a Webmin terminal module, we've removed Webshell. Obviously that is an issue if Webmin is broken!

I'm happy to assist with fixing Webmin, but unfortunately you'll need to log in via SSH to access a shell. If you are using Linux, OSX or Windows 10 build 1809 (or later), then you can use OpenSSH. It should be preinstalled by default, so open a terminal (IIRC you need to open PowerShell) and use the 'ssh' command - e.g.:

ssh root@IP_OR_DOMAIN

If you are using an older version of Windows and don't have OpenSSH you can install it. If you search for "install openssh windows" (or similar) you should find plenty of tutorials.

Or if you are using Windows and prefer a GUI based app, then you have a couple of options:

• PuTTY
• WinSCP

Once logged in, if you like you can use our built in "helper"/"wrapper" script/s to run composer and/or drush as the webserver user (www-data). The wrappers are 'turnkey-composer' and 'turnkey-drush' respectively. E.g.:

turnkey-composer COMMAND
turnkey-drush COMMAND

If you prefer to use composer/drush directly, then you'll need to manually run them as the webserver user. You can use the preinstalled su command. E.g. for composer:

su - www-data -s /bin/bash -c "cd /var/www/drupal10 && composer COMMAND"

Or install sudo:

apt update
apt install sudo

And then use that. E.g. for composer:

sudo -u www-data composer COMMANDS

As for Webmin, I'm more than happy to help you fix that. First try restarting the Webmin service:

systemctl restart webmin

And if that still doesn't get you going, please give me the output of these:

turnkey-version
netstat -tlnp
systemctl status webmin
journalctl -u webmin --since="10 minutes ago"

Please be sure to run the last line within 10 minutes of restarting Webmin and trying to access it.

Also it will likely be useful if you share your current Webmin miniserver config:

cat /etc/webmin/miniserv.conf