Fix Nginx Mozilla Repo Errors Quickly | Generated by AI

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Question: How do I fix the nginx/binary-i386/Packages architecture warning and the Mozilla apt repository 400 Bad Request error, and how do I remove those repositories?

Answer:

You have two separate issues to fix:

Issue 1: Nginx i386 Architecture Warning (N: warning)

This is not a real error — it’s just a notice. Your system is trying to fetch i386 (32-bit) packages from the nginx repo, but nginx only publishes amd64 packages.

Edit the nginx source file and add arch=amd64 to restrict it to 64-bit only:

sudo nano /etc/apt/sources.list.d/nginx.list

Change this:

deb [signed-by=/usr/share/keyrings/nginx-archive-keyring.gpg] http://nginx.org/packages/ubuntu jammy nginx

To this:

deb [arch=amd64 signed-by=/usr/share/keyrings/nginx-archive-keyring.gpg] http://nginx.org/packages/ubuntu jammy nginx

If there is no signed-by part, just add [arch=amd64] like this:

deb [arch=amd64] http://nginx.org/packages/ubuntu jammy nginx

Option B: Remove the nginx repository entirely

If you want to completely remove the nginx external repo:

sudo rm /etc/apt/sources.list.d/nginx.list

Issue 2: Mozilla Repository 400 Bad Request (E: error — this one IS a real error)

The 400 Bad Request [IP: 127.0.0.1 7890] error means your system is going through a local proxy (port 7890, likely Clash or a similar proxy tool), and the proxy is blocking or mishandling the request to packages.mozilla.org.

Fix A: Remove the Mozilla apt repository (cleanest solution)

Find the Mozilla source file:

ls /etc/apt/sources.list.d/ | grep -i mozilla

Then remove it:

sudo rm /etc/apt/sources.list.d/mozilla.list
# or whatever the filename is, e.g.:
sudo rm /etc/apt/sources.list.d/mozillateam-ubuntu-ppa-jammy.list

Also remove the associated GPG key if present:

sudo rm /usr/share/keyrings/mozillateam-archive-keyring.gpg

Fix B: Bypass the proxy for this specific domain

If you want to keep the Mozilla repo but fix the proxy issue, add a proxy bypass for packages.mozilla.org in your proxy software (e.g., Clash), or set no_proxy for apt:

sudo nano /etc/apt/apt.conf.d/99proxy-bypass

Add:

Acquire::https::packages.mozilla.org::DIRECT "true";

After Fixing — Run Update to Verify

sudo apt update

You should no longer see the N: warning or the E: error.

Summary Table

Issue Type Solution
nginx binary-i386 Warning (N:) Add arch=amd64 to nginx.list, or remove the file
Mozilla 400 Bad Request Error (E:) Remove mozilla source file, or fix proxy bypass

References:

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