I've recently installed ubuntu and I need Android SDK (and subsequently, adb) in order to develop my apps to college. The fact is that, no matter what I do, I can't get adb to work. Exporting its place to the PATH didn't worked. I only get "file or directory not found" error while this are the contents of the PATH variable:

renan@RocketQueen:~$ echo $PATH
/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/home/renan/adt/sdk/tools:/home/renan/adt/sdk/platform-tools

I don't want to install android-tools-adb/fastboot because they're outdate when compared to SDK Manager ones. What do I need to do in order for it to work from anywhere when called from terminal?