RStan produces no output

Summary:

There is no output from rstan while fitting

Description:

There is no output from rstan while fitting. I'm expecting messages such as:

Chain 1, Iteration: 1 / 1000 0%
Chain 1, Iteration: 2 / 1000 0%

This is occurring in Ubuntu 19.10 and Elementary OS 5.1. I have no issues in Windows 10 , but need to use linux since no multicore support for Windows

I have tried adding " refresh = 1 " to the stan command without success

I have reinstalled both "shinystan" and "rstan"

I know the fitting is being done because in the end it produces good data, but for longer analyses it would be extremely helpful to know the current progress. Any help would be much appreciated

Reproducible Steps:

Run command such as:

sflist = mclapply(1:4, mc.cores = 4, function (i) stan(fit=fit, seed=sample.int(.Machine$interger.max, 1), data = standata, iter=1000, chains=4, chain_id = i))

or

sflist = mclapply(1:4, mc.cores = 4, function (i) stan(fit=fit, seed=sample.int(.Machine$interger.max, 1), data = standata, iter=1000, chains=4, chain_id = i), refresh=1)

RStan Version:

2.19.2

R Version:

3.6.1

R Studio

1.2.5019 and 1.2.5033

Start with the stan calls shown in the reproducible steps, especially their use inside mclapply with mc.cores=4, and compare them with the refresh=1 variant. Verify whether fitting progress is emitted on Ubuntu 19.10 and Elementary OS 5.1 under the listed RStan and R versions; done means progress messages appear during fitting without preventing the final data from being produced.