[R] repository for ubuntu/linux mint for R 4.0.0

[Ista Zahn]

On Wed, Apr 29, 2020 at 8:33 PM Rasmus Liland <jensrasmus using gmail.com> wrote:
>
> On 2020-04-29 19:55 -0400, ProfJCNash wrote:
> > In updating (an older computer with) Linux Mint 18.3 I tried to add
> > the repository
> >
> > deb https://cloud.r-project.org/bin/linux/ubuntu xenial-cran40/
> >
> > as per the "Download R for Linux" instructions. This gave an error
> > that there was no Release.key file.
> >
> > After some investigation, I found that
> >
> > deb https://cran.r-project.org/bin/linux/ubuntu xenial-cran40/
> >
> > i.e., CRAN not CLOUD. With this change, I could install R 4.0.
> >
> > Is this a known glitch?
>
> Dear JN,
>
> perhaps it is a glitch ... does anyone run mirmon[1] on the R
> mirrors to see which ones are old?

https://cran.r-project.org/mirmon_report.html

>
> If you open those two addresses in a browser, you see that the
> xenial-cran40 folder is only present in cran case ...  These are
> two different servers, which can also be seen by running curl:
>
>         rasmus using twentyfive ~ % curl -I https://cloud.r-project.org/bin/linux/ubuntu/
>         HTTP/2 200
>         content-type: text/html;charset=ISO-8859-1
>         date: Thu, 30 Apr 2020 00:05:13 GMT
>         server: Apache/2.4.39 (Unix)
>         cache-control: max-age=1800
>         expires: Thu, 30 Apr 2020 00:35:13 GMT
>         x-cache: Miss from cloudfront
>         ...
>
>         rasmus using twentyfive ~ % curl -I https://cran.r-project.org/bin/linux/ubuntu/
>         HTTP/1.1 200 OK
>         Date: Thu, 30 Apr 2020 00:05:23 GMT
>         Server: Apache
>         Content-Type: text/html;charset=UTF-8
>
> It is wise to point your package manager to a mirror[2] close to you
> instead of a cdn, e.g. [3] or something ...
>
> Best,
> Rasmus
>
> [1] https://spacehopper.org/mirmon/
> [2] https://cran.r-project.org/mirrors.html
> [3] https://mirror.las.iastate.edu/CRAN/bin/linux/ubuntu/
>
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