Default packages not found in R (Ubuntu)

i'm new with R and i'm having some problems in making it work properly.

When I type "R" in my terminal (linux Ubuntu) I get the following warning:

During startup - Warning messages:
1: package ‘utils’ in options("defaultPackages") was not found
2: package ‘stats’ in options("defaultPackages") was not found

which I think are the cause of many other problems like not being able to install other packages.

I read a lot of similar question but they were very old and I have not been able to adapt them to my case.
Anyway, I think that the problem is something related to the default packeges folders.

I cannot install Rstudio because it's a machine with only terminal access.

Thanks to anyone who can help me.

if you go to https://cran.r-project.org/ and click on "download R for unix" , then select Ubuntu, you'll find a page full of info on how properly to install R and R packages from a terminal session.

However, if you somehow managed to destroy your Ubuntu install such that there is no Desktop at all and you can't even run a web browser, then you may have bigger problems.

I found the solution for my problem:

apparently during the loading of R, some bash script uses the which command to get the full path of something. Now, I don't know why, on my linux installation the which command was named which.debianutils and the executable /bin/which was not present. I solved with sudo apt reinstall debianutils.