# How do I disable ipv6 on Ubuntu 20.04

To disable IPv6 on your Ubuntu 20.04 system, open the `/etc/sysctl.conf` file in
your favorite text editor and put the following lines at the end of the file:

```bash
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
```

Then restart your system, and changes will take effect.