安装“ dplyr”软件包时出错-退出状态为非零

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当我调用

install.packages("dplyr")

这是显示的内容：

Installing package into ‘/usr/local/lib/R/site-library’
(as ‘lib’ is unspecified)
trying URL 'https://mran.microsoft.com/snapshot/2019-07-05/src/contrib/dplyr_0.8.3.tar.gz'
Content type 'application/octet-stream' length 1173098 bytes (1.1 MB)
==================================================
downloaded 1.1 MB

ERROR: failed to lock directory ‘/usr/local/lib/R/site-library’ for modifying
Try removing ‘/usr/local/lib/R/site-library/00LOCK-dplyr’
Warning in install.packages :
  installation of package ‘dplyr’ had non-zero exit status

The downloaded source packages are in
    ‘/tmp/RtmpDn3GWa/downloaded_packages’

看起来该dplyr软件包也不再位于我的用户库中。

请帮忙！其他安装程序包似乎运行良好。我不知道发生了什么，因为直到今天我对这个软件包一直没有任何问题，而我迫切需要在下周的最后一个星期中使用它。

谢谢！