Error when updating packages in Ubuntu 18.04

When I update the packages, I get this error:
mise à jour de la liste HTML des packages dans '.Library'
Warning messages:
1: In file.create(f.tg) :
  impossible de créer le fichier '/usr/share/R/doc/html/packages.html', à cause de 'Permission denied'
2: In make.packages.html(.Library) :

  impossible de mettre à jour l'index HTML des packages

I tried to solve the problem using 

sudo chmod -R 777 /usr/share/R/

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