cd /media/0839-00b7/aircrack-ng-1.1.tar.gz: No such file or directory
Actually aircrack-ng-1.1.tar.gz is not a directory but a gzipped archive. At first you have to extract it and most likely it will create a directory with the same name, without the suffix. You can verify it using:
tar tvf aircrack-ng-1.1.tar.gz
this will list all the files stored into the archive and their relative path. Then you can extract using
tar xvf aircrack-ng-1.1.tar.gz
Anyway, I agree with John VV: if you have doubts on this basic stuff, better to try another Linux distribution, more suitable for a beginner entry level. Mint? CentOS? You have plenty of choices. Good luck!