I downloaded SDK from the official website. I installed it, but when I try to use it this happens:
What mistake did I make?
I use Ubuntu 14.04.
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Did you install additional packages required for adb to work?
According to Google Android's SDK Page
If you are running a 64-bit distribution on your development machine, you need to install additional packages first. For Ubuntu 13.10 (Saucy Salamander) and above, install the
zlib1g:i386packages using apt-get:
sudo dpkg --add-architecture i386 sudo apt-get update sudo apt-get install libncurses5:i386 libstdc++6:i386 zlib1g:i386
For earlier versions of Ubuntu, install the
ia32-libspackage using apt-get:
apt-get install ia32-libs
You can check all the dependencies an executable needs using
objdump -x ./adb | grep NEEDED.
Make sure all required packages are present in your system. And finally, as @Firelord said, also make sure that the file is executable.