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How to install openssl35-libs in Ubuntu 26.04 (resolute)

Shared libraries for openssl35 (OpenSSL 3.5 LTS 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-libs

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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 shared libraries libssl.so.35.3 and libcrypto.so.35.3, along with engine and provider modules, installed under /usr/lib//openssl35/. The renamed SONAMEs guarantee a process can never accidentally resolve these symbols against the system libssl.so.3, even when both are loaded. An ld.so.conf.d snippet is shipped so the runtime linker can find them without rpath.

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