ggbiplot installation error

General
1

library(devtools)
Error: package or namespace load failed for ‘devtools’:
.onLoad failed in loadNamespace() for 'pkgload', details:
call: NULL
error: package ‘backports’ does not have a namespace
install_github("vqv/ggbiplot")
Error in install_github("vqv/ggbiplot") :
could not find function "install_github"

2

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