Bunzipping and then unTARring in two steps is not convenient.
It is not necessary to use Bunzip2 and then TAR to unzip a file in two separate steps.
Tar will do the job on its own if the -j switch is used, thus:
tar xjvf linux-source<version>.tar.bz2
By the same token, you may use the -z switch with a gzipped file, e.g.
tar zxvf linux-source<version>.tar.gz