Warning in install.packages :
unable to access index for repository https://cran.rstudio.com/bin/windows/contrib/3.6:
cannot open URL 'https://cran.rstudio.com/bin/windows/contrib/3.6/PACKAGES'
This seems a connectivity issue, is your internet connection behind a proxy server or firewall? That is usually the case when you are at work or school.
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I have tried using multiple networks but no use
Do you have a proxy or something ?
Can you download a file from internet in your R Session ?
I am with @andresrcs on this one. This usually comes from a connectivity issue between R and the web from your environment.
A couple of things to try
-
Choose a different CRAN repository, preferably closer to your geographical location.
-
Disable secure download option
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