R4.21下载了 BiocManager完全用不了怎么办

下载好 BiocManager后，如何用其下载GEOquery等包
一直报错，如下
4.2.1版本R

 BiocManager::install(version = "4.21")
Error: Bioconductor version cannot be validated; no internet connection?  See
  #troubleshooting section in vignette

或者用其他方法也不行，说是超时，打不开链接啥的

> source("https://bioconductor.org/biocLite.R")
Error in file(filename, "r", encoding = encoding) : 
  cannot open the connection to 'https://bioconductor.org/biocLite.R'
In addition: Warning message:
In file(filename, "r", encoding = encoding) :
  URL 'https://bioconductor.org/biocLite.R': Timeout of 60 seconds was reached

求解答qwq

补充：
解决了，把校园网改成热点就行。
给大家一点思路