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I am trying to set a VPN server on my PC (Ubuntu). I am following a tutorial , http://cviorel.easyblog.ro/2009/02/09/how-to-set-up-a-vpn-server-on-ubuntu/.

I made changes in various files including /etc/ufw/before.rules file.

When I run command

sudo ufw disable && sudo ufw enable

Then I got following error message:

Firewall stopped and disabled on system startup
ERROR: problem running ufw-init

ufw version is 0.31.1-1

Can anyone please guide me! I don't have any prior experience...please can someone tell me the steps to fix this problem?

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