Missing Package Dependencies on Azure App Service (Debian 10)

Updated:June 9, 2026

When deploying IronPDF to an Azure App Service Linux environment running a Debian 10 (Buster) base image, the Chrome renderer fails to start because the required system packages cannot be installed. This happens when IronPDF attempts to install its Chrome dependencies through APT, which reaches out to the standard Debian mirrors.

E: The repository 'http://deb.debian.org/debian buster Release' does not have a Release file.

Debian 10 reached End of Life and its repositories were removed from deb.debian.org. Any apt-get update call against the default Buster mirrors returns 404 errors, which blocks installation of required packages including libc6-dev, libgtk-3-0, libnss3, libatk-bridge2.0-0, libgbm1, libasound2, libxkbcommon-x11-0, libxrender1, libfontconfig1, and libxshmfence1.

Solution

Option 1: Redirect APT to the Debian archive mirrors

Run the following commands to update /etc/apt/sources.list to point at archive.debian.org before calling apt-get update:

sed -i 's|http://deb.debian.org/debian|http://archive.debian.org/debian|g' /etc/apt/sources.list
sed -i 's|http://deb.debian.org/debian-security|http://archive.debian.org/debian-security|g' /etc/apt/sources.list

sed -i 's|http://deb.debian.org/debian|http://archive.debian.org/debian|g' /etc/apt/sources.list
sed -i 's|http://deb.debian.org/debian-security|http://archive.debian.org/debian-security|g' /etc/apt/sources.list

SHELL

To suppress warnings about the expired release date, add this APT configuration entry:

echo 'Acquire::Check-Valid-Until "false";' > /etc/apt/apt.conf.d/99no-check-valid-until

echo 'Acquire::Check-Valid-Until "false";' > /etc/apt/apt.conf.d/99no-check-valid-until

SHELL

Then run apt-get update followed by the normal IronPDF Chrome dependency install.

Option 2: Upgrade to Debian 12 with .NET 8

Debian 10 is no longer maintained. The long-term fix is to migrate to a Debian 12 base image with .NET 8, which IronPDF fully supports. See the Linux deployment guide for the required packages on Debian 12 and other supported distributions.

Curtis Chau

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Technical Writer

Curtis Chau holds a Bachelor’s degree in Computer Science (Carleton University) and specializes in front-end development with expertise in Node.js, TypeScript, JavaScript, and React. Passionate about crafting intuitive and aesthetically pleasing user interfaces, Curtis enjoys working with modern frameworks and creating well-structured, visually appealing manuals.

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