On Mon, Aug 17, 2020 at 11:51:46PM +0200, Emanuel Berg via Users list for the GNU Emacs text editor wrote:
> Michael Albinus wrote:
> 
> > Still the mysterious "ESC Z ESC" sequence in the
> > way. You haven't used the "sshx" method, as
> > indicated. Pls repeat the test.
> 
> The shell says I don't have it (sshx). No luck in the
> Debian repos, either. Were do you get it?
> Emacs messages:

sshx is a Tramp "connection method", not an external program.
It uses ssh, although in a different way than the Tramp "ssh"
method (cf. Tramp manual, "4.2 Inline methods" or thereabouts).

Cheers
 - t