To setup locale in ubuntu

In terminal:

locale shows the locale currently used by your system
locale -a shows the locale present in your system
If one is missing, use :
sudo locale-gen fr_FR.UTF-8

and then sudo update-locale LANG=fr_FR.UTF-8 to define this as a default

The defaults are available here:
cat /etc/default/locale 

You can setup any of the following:
LANG=fr_FR.UTF-8
LANGUAGE=
LC_CTYPE=en_US.UTF-8
LC_NUMERIC="fr_FR.UTF-8"
LC_TIME="fr_FR.UTF-8"
LC_COLLATE="fr_FR.UTF-8"
LC_MONETARY="fr_FR.UTF-8"
LC_MESSAGES="fr_FR.UTF-8"
LC_PAPER="fr_FR.UTF-8"
LC_NAME="fr_FR.UTF-8"
LC_ADDRESS="fr_FR.UTF-8"
LC_TELEPHONE="fr_FR.UTF-8"
LC_MEASUREMENT="fr_FR.UTF-8"
LC_IDENTIFICATION="fr_FR.UTF-8"
LC_ALL=

And now you can run 
system("ssh login@ipv4.ipv4.ipv4.ipv4 \"R -e 'print(1)'\"") 

without warning !

 In R:
> Sys.getlocale()
[1] "LC_CTYPE=en_US.UTF-8;LC_NUMERIC=C;LC_TIME=fr_FR.UTF-8;LC_COLLATE=fr_FR.UTF-8;LC_MONETARY=fr_FR.UTF-8;LC_MESSAGES=fr_FR.UTF-8;LC_PAPER=fr_FR.UTF-8;LC_NAME=C;LC_ADDRESS=C;LC_TELEPHONE=C;LC_MEASUREMENT=fr_FR.UTF-8;LC_IDENTIFICATION=C"

Il faut laisser LC_NUMERIC à la valeur de C pour éviter un comportement étrange de R:

> Sys.setlocale(category = "LC_NUMERIC", locale="fr_FR.UTF-8")
[1] "fr_FR.UTF-8"
Warning message:
In Sys.setlocale(category = "LC_NUMERIC", locale = "fr_FR.UTF-8") :
  changer 'LC_NUMERIC' peut résulter en un fonctionnement étrange de R
> Sys.localeconv()
    decimal_point     thousands_sep          grouping   int_curr_symbol 
              ","               " "            "\003"            "EUR " 
  currency_symbol mon_decimal_point mon_thousands_sep      mon_grouping 
              "€"               ","               " "            "\003" 
    positive_sign     negative_sign   int_frac_digits       frac_digits 
               ""               "-"               "2"               "2" 
    p_cs_precedes    p_sep_by_space     n_cs_precedes    n_sep_by_space 
              "0"               "1"               "0"               "1" 
      p_sign_posn       n_sign_posn 
              "1"               "1" 
> 120.215
[1] 120,215

Only the display uses the coma for decimal point; the numbers are still entered with a .

Come back to more normal behavior:
Sys.setlocale(category = "LC_NUMERIC", locale="C")



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