Login with firewall enabled leads to black screen

Unexplainable

1/4/24, 10:05 PM

I am using Ubuntu 22.04 LTS with desktop running on Xorg.

I wanted to do some work on my notebook today, so I got up, booted the computer, logged in and stared at the black screen for a while. After 5 minutes of staring at it, I realised, that the blackness was starting to spread into my soul because it seemed that I will probably spend a day trying to fix the computer.

So I began troubleshooting, reinstalled ubuntu-desktop, gdm, xorg, purged and reinstalled and uninstalled nvidia drivers, nothing worked. I scoured the internet for any solution, nothing helped.

I almost erased the disk and reinstalled Ubuntu, but then I remembered, that I was trying to set up a firewall using ufw the day before. So I disabled it, rebooted, and voilá! The black screen disappeared.

The firewall was configured with:

sudo ufw default allow outgoing
sudo ufw default deny incoming

So the question is, why? Why would a firewall interfere with the local desktop environment? Should I allow some ports or something? I really do not understand why this happened.

0 + 0

nvidia

xorg

firewall

ufw

22.04

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: Login with firewall enabled leads to black screen

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