Signe du package d'installation, avait de sortie non nulle dans Ubuntu 14.04 LTS 32 bits

Lorsque vous essayez d'installer le signe paquet sur Ubuntu 14.04 LTS 32 bits, j'ai reçu les avertissements suivants

The downloaded source packages are in/tmp/RtmpnrWGAe/downloaded_packages’ 



 Warning messages:  
1: In install.packages("caret") :
  installation of package ‘nloptr’ had non-zero exit status   
2: In install.packages("caret") :
  installation of package ‘lme4’ had non-zero exit status  
3: In install.packages("caret") :
  installation of package ‘pbkrtest’ had non-zero exit status  
4: In install.packages("caret") :
  installation of package ‘BradleyTerry2’ had non-zero exit status
5: In install.packages("caret") :
  installation of package ‘car’ had non-zero exit status  
6: In install.packages("caret") :
  installation of package ‘caret’ had non-zero exit status