Installing LLVM releases via apt-get: "Unable to locate package"

Try:

wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
sudo apt-add-repository "deb http://apt.llvm.org/bionic/ llvm-toolchain-bionic-11 main"
sudo apt-get update
sudo apt-get install -y llvm-11 llvm-11-dev clang-11 llvm-11-tools

Btw, neither LLVM 12 nor LLVM 13 have been released yet.

-Andrzej

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