Unable to locate package clang+

The correct package name for installing Clang on Ubuntu is `clang`. You can install it by running the following command in the terminal:

sudo apt-get update
sudo apt-get install clang

If you need a specific version of Clang, you can use the following command to install it:

sudo apt-get install clang-<version number>

For example, to install Clang 10, you can use the following command:

sudo apt-get install clang-10

I hope this helps! Let me know if you have any further questions.