I just wanted to report that RStudio 1.4.1106 does not work on Ubuntu 20.04.2 LTS due to an incompatibility in libraries. It installs but cannot launch. The error message was
rstudio: error while loading shared libraries: libssl.so.1.0.2
My understanding is that libssl.so.1.0.2 is not (or no longer) available on this version of Ubuntu.
I reverted to the older Rstudio 1.3 instead, which works. I hope it is useful to some.