RStudio cannot find install.packages on Linux (Manjaro, Arch)

[lateres]

Hi, It's as the title says, for some reason, RStudio can't find the install.packages function, or at least, that's what it says. If I run install.packages("package"), it's clearly there and runs but fails, midway through. Here's an example (happens with other packages I tried too):

> install.packages("xml2")
Installing package into ‘/home/ydeng/R/x86_64-pc-linux-gnu-library/4.1’
(as ‘lib’ is unspecified)
trying URL 'https://cran.rstudio.com/src/contrib/xml2_1.3.2.tar.gz'
Content type 'application/x-gzip' length 271876 bytes (265 KB)
==================================================
downloaded 265 KB



Loading local functions ...Error in install.packages("httr") : 
  could not find function "install.packages"
Calls: source ... eval -> eval -> source -> withVisible -> eval -> eval
Execution halted
Warning in install.packages :
  installation of package ‘xml2’ had non-zero exit status

The downloaded source packages are in
	‘/tmp/RtmpsaepDQ/downloaded_packages’

Interestingly enough, if I run the command in a normal terminal running R, it works fine after prompting for selecting a secure CRAN mirror.

Any help is appreciated!

[lateres]

So I noticed that it was complaining about the httr package no matter which package I told it to install, so I manually installed httr and that fixed it. If anyone can explain this to me, I'd appreciate it. I know httr is used in the .Rprofile.