R无法安装RMySQL程序包解决方案

在R的交互环境下利用 install.packages(“RMySQL”)在线安装RMySQL程序包出现如下错误：

> install.packages("RMySQL")
将程序包安装入‘/usr/local/lib/R/site-library’
(因为‘lib’没有被指定)
Warning in install.packages("RMySQL") :
  'lib="/usr/local/lib/R/site-library"'不可写
Would you like to use a personal library instead?  (y/n) y
Would you like to create a personal library
~/R/x86_64-pc-linux-gnu-library/3.4
to install packages into?  (y/n) y
Warning: 无法在貯藏處https://cloud.r-project.org/src/contrib中读写索引:
  无法打开URL'https://cloud.r-project.org/src/contrib/PACKAGES'
Warning message:
package ‘RMySQL’ is
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