Hi Community,
All my PKGS were working OK
in latest Rstudio 1.4.1103 /Linux,
until I upgraded yesterday to R V 4.1.0. 
Some pkgs still work OK inside Rstudio.
But other PKGs ONLY work
if R 410 is called from a Linux Terminal,
(ie: not from the Rstudio Console).
Inside Rstudio,
some PKGS give a big msg popup:
"Fatal Error!" (with a pic of a bomb and lit fuse!)
How do I install the latest Rstudio (f/Linux),
which works with this new installed R 4.1.0. ?.
Any way to go back to the previous Rstudio bliss,
(pre-R410 ) where all PKGS work ok?. 
SFdude
San Francisco
**R version 4.1.0 (2021-05-18) **
= latest R upgrade caused PKGs havoc in Rstudio!
latest Rstudio 1.4.1103
Ubuntu LINUX 20.04