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How to install openssl35 in Ubuntu 26.04 (resolute)

OpenSSL 3.5 LTS command-line tools (GetPageSpeed build with ECH)

Install

curl -fsSL https://extras.getpagespeed.com/release-latest.deb -o /tmp/getpagespeed-release.deb
sudo apt-get install -y /tmp/getpagespeed-release.deb
rm /tmp/getpagespeed-release.deb
sudo apt-get update
sudo apt-get install -y openssl35

Installing packages requires an active GetPageSpeed subscription. For other releases and channels, use the setup wizard.

Description

An ABI-isolated build of the OpenSSL 3.5 LTS line carrying the Encrypted Client Hello (ECH, RFC 9849) backport from the DEfO project, plus TLS certificate compression (zlib, brotli, zstd), kTLS and post-quantum key exchange (X25519MLKEM768). It is installed alongside the system OpenSSL and does not replace libssl3. This package provides the openssl command-line utility from the openssl35 build, installed as /usr/bin/openssl35 to avoid clashing with the system /usr/bin/openssl. It includes the "openssl35 ech" subcommand for generating ECH keys.

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