Having trouble installing and loading tidyverse- No DIB package
It sounds like you do not have a dependency installed which tidyverse needs to run correctly. 

Usually dependencies install with the package, but at times you need to coerce them to do so, so I usually install with the coercion for all packages.

install.packages("tidyverse", dependencies=TRUE)


In this case, if that was the only error, or you installed in this manner and did not get DBI, then I would just install it directly:

install.packages("DBI", dependencies=TRUE)


Once you have done that, if you are still having problems, explicitly load DBI:

require(DBI) or library(DBI)

and you should be good to go. 

If you have a problem still, comment and I will try to help you chase it down.