I've hit a bug on Ubuntu 20.04. The issue occurred both with the R version that shipped with Ubuntu last week, and it is occurring now with the CRAN packages from one of the mirros (deb http://cran.mirror.garr.it/mirrors/CRAN/bin/linux/ubuntu/ focal-cran40/). The issue occurs whether I use the deb package for viridis in the Ubuntu repos, or I install it with `install.packages()` in R.

The issue is that when I call a function from the 'viridis' package (e.g. running the first example in the `viridis` vignette: https://cran.r-project.org/web/packages/viridis/vignettes/intro-to-viridis.html) R gets stuck indefinitely; the system monitor shows the R process using CPU resources but nothing happens at the terminal and I'm also unable to stop the function with Ctrl-C.

I did a little digging and simply calling the function `viridis` from the `viridisLite` package causes the same problem, execution gets stuck at the line:

    cols <- fn_cols(seq(begin, end, length.out = n)) / 255

which is line 177 here: https://github.com/sjmgarnier/viridisLite/blob/master/R/viridis.R#L177

I'm dual booting Debian Buster on the same machine and no such issue occurs with R 4.0.0 and the same versions of the `viridis` and `viridisLite` packages. Also no such issue occurs on Windows 10 or on a Mac both with R 4.0.0 and the latest versions of `viridis` and `viridisLite`.

I was not sure where should I report the bug, so I thought of asking for advice here first.

Best,

Sam

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