Installing android-sdk or adt-bundle on Ubuntu 12.04

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http://stackoverflow.com – So on my previous laptop I've installed the android-sdk-linux and Eclipse separately without the adt-bundle, without any issues whatsoever. Also, I installed it under my home directory. Now that I have a new laptop (clean slate) to start with, I wanted to try and install the adt-bundle into the correct/conventional directory (which I understand is /usr/local/). But after extracting the bundle into /usr/local/ I get weird issues like adb not being an executable, etc. Opening Eclipse yields a lot of errors regarding the SDK, ADT, and adb. What is the correct method of doing this? A step-by-st (HowTos)