How to fix Error cannot open connection on Ubuntu machine? - r

Question

This might be a very trivial issue with R-related Ubuntu settings, but I'm pretty new to it and have no clue to solve this issue.
I'm trying to load a file from URL on a linux Ubuntu machine into R (R-Studio) with different strategies:
load(url("http://www.yaj.ch/data/test.rda"))
read.csv(url("http://www.yaj.ch/data/test.csv"))
readstata13::read.dta13("http://www.yaj.ch/data/test.dta")
data.table::fread("http://www.yaj.ch/data/test.csv")
but they all fail with similar error messages:
Error in load(url("http://www.yaj.ch/data/test.rda")) :
cannot open the connection to 'http://www.yaj.ch/data/test.rda'
In addition: Warning message:
In load(url("http://www.yaj.ch/data/test.rda")) :
cannot open URL 'http://www.yaj.ch/data/test.rda': HTTP status was '403 Forbidden'
that of fread is somewhat different:
trying URL 'http://www.yaj.ch/data/test.csv'
Error in download.file(input, tmpFile, method = method, mode = "wb", quiet =
!showProgress) :
cannot open URL 'http://www.yaj.ch/data/test.csv'
In addition: Warning message:
In download.file(input, tmpFile, method = method, mode = "wb", quiet =
!showProgress) :
cannot open URL 'http://www.yaj.ch/data/test.csv': HTTP status was '403 Forbidden'
This is what I got when I was mobile:
Error in load(url("http://www.yaj.ch/data/test.rda")) :
cannot open the connection to 'http://www.yaj.ch/data/test.rda'
Calls: <Anonymous> ... withCallingHandlers -> withVisible -> eval -> eval -> load
Execution halted
When I Shift-click on the link in the script, the data opens in the browser, so the connection seems to be okay.
On my Windows machine everything works fine. So I guessed the issue is related to Ubuntu, as if R has connection problems or wrong access rights. But I'm not sure, since strangely enough e.g. this one opens in Ubuntu:
load(url("http://www.rdatamining.com/data/graph.rdata?attredirects=0&d=1"))
This solution wasn't helpful to me, and Google won't tell me anything either.
Is there any help?