Thank you for your response Kevin.
The strange think is that I already installed the aforementioned version of Rstudio in another SLES 15 system and it works like a charm.
I tried to go with the server version you proposed me, however I received the following error
Sep 11 11:53:27 swiss rserver[25999]: ERROR R did not return any output when queried for directory location information; LOGGED FROM: bool rstudio::core::r_util::{anonymous}::detectRLocationsUsingR(const string&, rstudio::core::FilePath*, rstudio::core::FilePath*, rstudio::core::config_utils::Variables*, std::__cxx11::string*, const string&) /var/lib/jenkins/workspace/IDE/open-source-pipeline/v1.2-patch/src/cpp/core/r_util/REnvironmentPosix.cpp:498
The R is installed and works properly.Please see the output below. Any idea how to force rstudio to look for R in the specific path?
vasilis@swiss:$ R --slave --vanilla -e "cat(paste(R.home('home'),R.home('share'),R.home('include'),R.home('doc'),'',sep='\n'))"
/home/vasilis/Desktop/apps/R-3.6.1/lib64/R
/home/vasilis/Desktop/apps/R-3.6.1/lib64/R/share
/home/vasilis/Desktop/apps/R-3.6.1/lib64/R/include
/home/vasilis/Desktop/apps/R-3.6.1/lib64/R/doc
thank you in advance