doc: Update Guix installation instructions for Debian/Ubuntu #34545

1. 
   ToRyVand commented at 6:05 am on February 10, 2026: none

   The guix package was removed from Debian repositories due to security vulnerabilities (CVE-2025-46415, CVE-2025-46416) affecting guix-daemon. See https://lwn.net/Articles/1035491/

   Ubuntu and Debian derivatives will likely follow.

   Updates the Debian/Ubuntu section to warn users and redirect to alternative installation methods already documented in the file.

   Fixes #33982

2. doc: Update Guix installation instructions for Debian/Ubuntu

   The 'guix' package was removed from Debian repositories (see
   https://lwn.net/Articles/1035491/). Ubuntu and other Debian derivatives
   will likely follow.
   
   Update INSTALL.md to reflect this change and redirect users to
   alternative installation methods (shell script, binary tarball, or
   build from source).
   
   Fixes #33982

   ca427362ba
3. DrahtBot added the label Docs on Feb 10, 2026
4. 
   DrahtBot commented at 6:05 am on February 10, 2026: contributor

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5. 
   janb84 commented at 9:07 am on February 10, 2026: contributor

   ~0 for me, PR #33574 has already updated this documentation with the hope that things would change with release 1.5.0 of Guix. Without more clarity on this issue i would not update the documentation for now.

   Also the wording of in this PR would make it so that we have to update the documentation (soon) when Guix status on ubuntu is more defined.

6. 
   maflcko commented at 9:16 am on February 10, 2026: member

   I guess guix upstream hasn’t really committed to providing easy-to-backport security patches, so debian is unlikely to re-add this package?

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ToRyVand DrahtBot janb84 maflcko

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