Unable to install LLVM 11 to ARM Focal

Hi

I use following settings to install LLVM 11:

addons:
  apt:
    sources:
    - sourceline: "deb http://apt.llvm.org/focal/ llvm-toolchain-focal-11 main"
      key_url: "https://apt.llvm.org/llvm-snapshot.gpg.key"
packages:
- clang-tools-11
- clang-11

This works good for x86_64 or for LLVM 10, but not for LLVM 11 on ARM. The error build example can be found here: https://travis-ci.com/github/MIPT-ILab/mipt-mips/jobs/430644398

http://apt.llvm.org/focal/ llvm-toolchain-focal-11 main does not provide packages for ARM64: https://apt.llvm.org/focal/dists/llvm-toolchain-focal-11/main/ .

Same for llvm-toolchain-focal-10, so if this works for you for LLVM10, you must be getting them from somewhere else.