library(tidyverse)
Erro: package or namespace load failed for ‘tidyverse’ in dyn.load(file, DLLpath = DLLpath, ...):
impossível carregar objeto compartilhado '/home/usuario/R/x86_64-pc-linux-gnu-library/3.5/xml2/libs/xml2.so':
/home/usuario/R/x86_64-pc-linux-gnu-library/3.5/xml2/libs/xml2.so: symbol htmlReadFile version LIBXML2_2.6.0 not defined in file libxml2.so.2 with link time reference
library(xml2)
Erro: package or namespace load failed for ‘xml2’ in dyn.load(file, DLLpath = DLLpath, ...):
impossível carregar objeto compartilhado '/home/usuario/R/x86_64-pc-linux-gnu-library/3.5/xml2/libs/xml2.so':
/home/usuario/R/x86_64-pc-linux-gnu-library/3.5/xml2/libs/xml2.so: symbol htmlReadFile version LIBXML2_2.6.0 not defined in file libxml2.so.2 with link time reference
It seems your libxml2 version is not compatible or there is a symlink pointing to a wrong version, sadly this is system specific so I can't investigate on my side.
Maybe someone else that has experienced this same issue might be able to help you.