我试图在Ubuntu 14.04上安装R 3.0.2 devtools软件包，如下所示：
install.packages("devtools")
我得到以下结果：
Installing package into ‘/home/jim/R/x86_64-pc-linux-gnu-library/3.0’ (as ‘lib’ is unspecified) --- Please select a CRAN mirror for use in this session --- Warning: dependency ‘xml2’ is not available also installing the dependency ‘rversions’ trying URL 'http://cran.rstudio.com/src/contrib/rversions_1.0.1.tar.gz' Content type 'application/x-gzip' length 4624 bytes opened URL ================================================== downloaded 4624 bytes trying URL 'http://cran.rstudio.com/src/contrib/devtools_1.8.0.tar.gz' Content type 'application/x-gzip' length 141487 bytes (138 Kb) opened URL ================================================== downloaded 138 Kb ERROR: dependency ‘xml2’ is not available for package ‘rversions’ * removing ‘/home/jim/R/x86_64-pc-linux-gnu-library/3.0/rversions’ ERROR: dependency ‘rversions’ is not available for package ‘devtools’ * removing ‘/home/jim/R/x86_64-pc-linux-gnu-library/3.0/devtools’ The downloaded source packages are in ‘/tmp/RtmpmDzsRJ/downloaded_packages’ Warning messages: 1: In install.packages("devtools") : installation of package ‘rversions’ had non-zero exit status 2: In install.packages("devtools") : installation of package ‘devtools’ had non-zero exit status
似乎有一个名为xml2的包的依赖。有人知道我在哪里可以找到这个包，我可以如何安装它。
我已经安装了以下内容：
sudo apt-get install libxml2-dev sudo apt-get install libcurl4-openssl-dev sudo apt-get install libcurl4-gnutls-dev sudo apt-get install curl
