What do you mean with
when my linux system gets updated,
? Do you mean running sudo apt update? In that case, I don't think so. After running sudo apt update, I think you can get a new version of CRAN R (if in meantime the Ubuntu team has updated the version in the apt Ubuntu repository), with
sudo apt install r-base
But MRO is not in the Ubuntu apt repository, so no, I don't think it will get updated. As a matter of fact, the only reason why options(repos = c(CRAN ="https://cloud.r-project.org/")) works is because MRO (unlike Renjin and pqR) is compatible with the CRAN R packages.