(no subject)

Dear Luigi,

These questions (and your previous one about R on Chromebook) are best
directed to the R-SIG-Debian mailing list [*], or maybe Ubuntu forums
[**]. I think that they are off-topic here on R-help.

Here is a short advice: try to make sure that you have the
r-recommended package installed from CRAN, not Ubuntu repository. If
that doesn't help, try to raise the priority [***] of packages from the
CRAN repository in order to avoid them being superseded by Ubuntu
packages. Another workaround would be removing the *.deb kernsmooth and
nnet packages from the system and installing them manually from CRAN in
the personal library by means of install.packages().

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Best regards,
Ivan

[*] https://stat.ethz.ch/mailman/listinfo/r-sig-debian
[**] https://ubuntuforums.org/
[***] https://jaqque.sbih.org/kplug/apt-pinning.html