[R] Sometimes commands do not terminate after upgrading to R 4.0 and Ubuntu 20.04

obably working on RStudio during the upgrade to Ubuntu 20.04. Also, I can't recall if this issue started after I upgraded R and RStudio (which would be my best guess) or after I upgraded Ubuntu (a day or two later). I hope someone can help. -- Adrien Fabre École d'Économie de Paris/Par

[R] Sometimes commands do not terminate after upgrading to R 4.0 and Ubuntu 20.04

I have upgraded R (from 3.6 to 4.0) and RStudio (from 1.1 to 1.2.5) a few days ago, and Ubuntu from 18.04 to 20.04 yesterday. Since then, R sometimes never terminates when executing certain commands: ivreg (from package AER), summary (of a logit regression) and logitmfx (from package mfx). Sometim