Ubuntu Linux installation instructions:
1. If you have not obtained packages from this PPA (Personal Package Archive) before:
$ sudo add-apt-repository ppa:jnogatch/wsjtx
2. To obtain the latest version from this PPA:
$ sudo apt-get update
$ sudo apt-get install wsjtx
3. You should also download kvasd and put it in the same directory as executable binaries wsjtx and jt9. Normally (after running the script /usr/bin/wsjtx once) this directory will be $HOME/.wsjtx.