Documentation on Uninstall leaves iptables altered.

[frohro]

In the docs here https://docs.tutor.edly.io/install.html at the end of the page are instructions on how to uninstall tutor. Unfortunately, one reason I wanted to uninstall tutor was it was conflicting with the IP addresses needed for my school's VPN. It leaves it like this:
~$ sudo iptables -L
Chain INPUT (policy ACCEPT)
target prot opt source destination
LIBVIRT_INP all -- anywhere anywhere

Chain FORWARD (policy ACCEPT)
target prot opt source destination
DOCKER-USER all -- anywhere anywhere
DOCKER-ISOLATION-STAGE-1 all -- anywhere anywhere
ACCEPT all -- anywhere anywhere ctstate RELATED,ESTABLISHED
DOCKER all -- anywhere anywhere
ACCEPT all -- anywhere anywhere
ACCEPT all -- anywhere anywhere
ACCEPT all -- anywhere anywhere ctstate RELATED,ESTABLISHED
DOCKER all -- anywhere anywhere
ACCEPT all -- anywhere anywhere
ACCEPT all -- anywhere anywhere
LIBVIRT_FWX all -- anywhere anywhere
LIBVIRT_FWI all -- anywhere anywhere
LIBVIRT_FWO all -- anywhere anywhere

Chain OUTPUT (policy ACCEPT)
target prot opt source destination
LIBVIRT_OUT all -- anywhere anywhere

Chain DOCKER (2 references)
target prot opt source destination

Chain DOCKER-ISOLATION-STAGE-1 (1 references)
target prot opt source destination
DOCKER-ISOLATION-STAGE-2 all -- anywhere anywhere
DOCKER-ISOLATION-STAGE-2 all -- anywhere anywhere
RETURN all -- anywhere anywhere

Chain DOCKER-ISOLATION-STAGE-2 (2 references)
target prot opt source destination
DROP all -- anywhere anywhere
DROP all -- anywhere anywhere
RETURN all -- anywhere anywhere

Chain DOCKER-USER (1 references)
target prot opt source destination
RETURN all -- anywhere anywhere

Chain LIBVIRT_FWI (1 references)
target prot opt source destination
ACCEPT all -- anywhere 192.168.122.0/24 ctstate RELATED,ESTABLISHED
REJECT all -- anywhere anywhere reject-with icmp-port-unreachable

Chain LIBVIRT_FWO (1 references)
target prot opt source destination
ACCEPT all -- 192.168.122.0/24 anywhere
REJECT all -- anywhere anywhere reject-with icmp-port-unreachable

Chain LIBVIRT_FWX (1 references)
target prot opt source destination
ACCEPT all -- anywhere anywhere

Chain LIBVIRT_INP (1 references)
target prot opt source destination
ACCEPT udp -- anywhere anywhere udp dpt:domain
ACCEPT tcp -- anywhere anywhere tcp dpt:domain
ACCEPT udp -- anywhere anywhere udp dpt:bootps
ACCEPT tcp -- anywhere anywhere tcp dpt:67

Chain LIBVIRT_OUT (1 references)
target prot opt source destination
ACCEPT udp -- anywhere anywhere udp dpt:domain
ACCEPT tcp -- anywhere anywhere tcp dpt:domain
ACCEPT udp -- anywhere anywhere udp dpt:bootpcTo revert iptables to the original state in Ubuntu, you can flush all the rules and set the default policies to ACCEPT. Here are the steps:

Flush all existing rules:

sudo iptables -F
sudo iptables -t nat -F
sudo iptables -t mangle -F
sudo iptables -t raw -F
Delete all user-defined chains:

sudo iptables -X
sudo iptables -t nat -X
sudo iptables -t mangle -X
sudo iptables -t raw -X
Set the default policies to ACCEPT:

sudo iptables -P INPUT ACCEPT
sudo iptables -P FORWARD ACCEPT
sudo iptables -P OUTPUT ACCEPT
This will reset iptables to its original, permissive state. If you have saved rules that you want to restore, you can do so with iptables-restore from a backup file.
ACCEPT tcp -- anywhere anywhere tcp dpt:68

[frohro]

This attempt to fix the problem did not survive a reboot.

[frohro]

Maybe these iptables were created by installing docker.

[frohro]

It might help if a mention of removing docker if it was installed only for tutor was included (for guys like me who don't think of that very quickly).