[QE-users] running error with ubuntu-20.04

[Lorenzo Paulatto]

> 2. The --host command line parameter, via a ":N" suffix on the
>
> hostname (N defaults to 1 if not provided)
>

This is an mpiexec error, not a qe error. Did you try to just do what it
asks? Add the option --host localhost:4 (or whatever number of cores you
have) to mpiexec (i.e. before pw.x). Also, I don't know if mpirun is just
an alias to mpiexec, but I would try it instead. Cheers
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