Hello vaalealgar,
First a word of caution - if you remove Access Server you lose all configuration including all certificates meaning if you're trying to fix a situation that is already in production use you are going to have to reinstall all VPN clients after deleting configuration. Just so future readers are aware.
Now then, after doing apt --purge remove openvpn-as openvpn-as-bundled-clients, Access Server should be pretty much blown away. You can clean up the /usr/local/openvpn_as/ directory by deleting it entirely. Then there will be no configuration or backups or anything left at all.
But you shouldn't do this as a first step. If your configuration is broken then fix your configuration or reset your configuration. Removing the program is an over-the-top approach that should be tried last.
I recommend you try to reset ports and interfaces to defaults. Go to this page and go to the section titled "Reset interface and port configuration to default" and run the commands there:
https://openvpn.net/vpn-server-resources/restoring-a-failed-access-server-to-normal-function/
Then try again. If you still have a failure, try reading /var/log/openvpnas.log for any obvious problems. If that doesn't reveal anything then try resetting your configuration entirely. Note that this wipes all settings and you will lose certificates and such that are generated on this server. You'll start fresh, basically. Run this command to do this:
ovpn-init
If after this you still have a failure, then try the apt --purge remove thing and doing a reinstall from instructions on our website. If then things are still broken you've encountered an unexpected situation and we suggest you send /var/log/openvpnas.log to our support ticket system for analysis with details of your system and what you've done to date to this system to get it into this state. We'll then try to figure out a solution.
Kind regards,
Johan
