android ubuntu installation problem - installation

I am trying to install android SDK on ubuntu.
I am following the steps here.
However, when I type in android in the terminal, I am getting the error
android: command not found
What is the solution? Why is this happening?
I searched on internet and found a solution that I should change etc/apt/sources.list
But it did not work.
Thank you.

You need to add the android binaries to your PATH.
http://www.troubleshooters.com/linux/prepostpath.htm

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Flutter_CLI: Because every version of flutterfire_cli depends on xml >=5.3.0 which requires SDK version >=2.14.0 <3.0.0, flutterfire_cli is forbidden

I am trying to install firebase_cli for my flutter project, but it tells me:
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I went to flutter console as administrator and run choco upgrade dart-sdk. It told me I now have version v2.17.3.
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Things I've tried:
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In my pubspec.yaml file I've got .
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I can tell I'm working with the new dart version in my VSCode now, thanks to the new features it has, but firebase still won't let me install CLI. Thank you in advance for your help.
Try this:
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Run dart --version to make sure the new path is working
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Uninstall Xcode 😢
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