我正在尝试在Ubuntu上安装R中的lubridate。出现以下错误。从其他来源了解到，这与我的系统有关。请帮助我解决此问题:
> install.packages('lubridate')
Installing package(s) into ‘/home/leader/R/i686-pc-linux-gnu-library/2.15’
(as ‘lib’ is unspecified)
trying URL 'http://cran.rstudio.com/src/contrib/lubridate_1.3.2.tar.gz'
Content type 'application/x-gzip' length 284897 bytes (278 Kb)
opened URL
==================================================
downloaded 278 Kb
* installing *source* package ‘lubridate’ ...
** package ‘lubridate’ successfully unpacked and MD5 sums checked
** R
** data
** moving datasets to lazyload DB
** inst
** preparing package for lazy loading
Error in setClass("Period", contains = c("Timespan", "numeric"), slots = c(year = "numeric", :
unused argument(s) (slots = c(year = "numeric", month = "numeric", day = "numeric", hour = "numeric", minute = "numeric"))
Error : unable to load R code in package ‘lubridate’
ERROR: lazy loading failed for package ‘lubridate’
* removing ‘/home/leader/R/i686-pc-linux-gnu-library/2.15/lubridate’
Warning message:
In install.packages("lubridate") :
installation of package ‘lubridate’ had non-zero exit status