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So, I followed this answer on this post and now I want to undo the changes.

How do I even know something has changed?
And if something changed, how would I undo it?

zx485
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The Dude
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    Welcome to Ask Ubuntu. A quick scan of your provided link showed it blacklisted ipv6. If this is all you did, you only need remove those lines (which if you followed the accepted answer, was 2 comments that do nothing except document what you did, and the blacklist line). I'd use my favorite editor & comment out the blacklist line (eg. sudo vim /etc/modprobe.d/blacklist-ipv6.conf), but you could also just remove the file... If it were me, I'd also check your history (looking for when you did it; I add date/time to my history so it's easier to find things) & scan for doco you left.. – guiverc Sep 02 '18 at 00:39

1 Answers1

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The directions you linked to state to create a file /etc/modprobe.d/blacklist-ipv6.conf containing some text which will instruct the system to never load the IPv6 kernel module.

To undo this, you simply remove the file, with sudo, and then reboot.

sudo rm /etc/modprobe.d/blacklist-ipv6.conf
sudo reboot   # Or reboot from the GUI, it doesn't matter how you reboot

Upon reboot, the kernel will be able to load the IPv6 modules, and you will then be able to configure (or autoconfigure) IPv6 on your system.

Michael Hampton
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