[installation] 404 on apt.llvm.org repository for noble (ubuntu 24.04)

[ryuujo1573]

Reproduce:

wget https://apt.llvm.org/llvm.sh -O - | sudo bash -s -- 16 all 

Trying to install llvm@16 on ubuntu noble (24.04).

Error:

Hit:7 https://apt.llvm.org/noble llvm-toolchain-noble InRelease
Err:8 https://apt.llvm.org/noble llvm-toolchain-noble-16 Release
  404  Not Found [IP: 198.18.0.73 443]
Reading package lists... Done
E: The repository 'http://apt.llvm.org/noble llvm-toolchain-noble-16 Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
+ apt-get update
Hit:1 http://archive.ubuntu.com/ubuntu noble InRelease
Hit:3 http://archive.ubuntu.com/ubuntu noble-updates InRelease
Hit:4 http://security.ubuntu.com/ubuntu noble-security InRelease
Hit:5 http://archive.ubuntu.com/ubuntu noble-backports InRelease
Ign:2 https://apt.llvm.org/noble llvm-toolchain-noble-16 InRelease
Hit:6 https://apt.llvm.org/noble llvm-toolchain-noble-18 InRelease
Hit:7 https://apt.llvm.org/noble llvm-toolchain-noble InRelease
Err:8 https://apt.llvm.org/noble llvm-toolchain-noble-16 Release
  404  Not Found [IP: 198.18.0.73 443]
Reading package lists... Done
E: The repository 'http://apt.llvm.org/noble llvm-toolchain-noble-16 Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

I have no idea.

[sylvestre]

Yeah, we support trunk (19), dev version (18) and stable (17)