Ubuntu 20.04.4 ------[sudo apt-get install -y llvm-13-dev]----- erro：E: Unable to locate package: llvm-13-dev

[hz0908]

Describe the bug
On Ubuntu 20.04.4 system, I use the command---[sudo apt-get install -y llvm-13-dev], but it shows that" E: Unable to locate package: llvm-13-dev"

To Reproduce
Steps to reproduce the behavior:
[sudo apt-get install -y llvm-13-dev]
erro:

Expected behavior
llvm 13 is installed successfully
erro:E: Unable to locate package: llvm-13-dev
Additional context
Add any other context about the problem here.

Tests
Optional: Add a link to a PR or a branch where you have a failing test of the issue.

[ghaith]

You might want to follow this https://apt.llvm.org/ to install LLVM on debian based distros
As this is not related to Rusty, i will just convert it to a discussion