You can also unset them at the end of .bashrc:
unset LD_LIBRARY_PATH
unset LD_PRELOAD
Or you create an alias:
alias jl='unset LD_LIBRARY_PATH; unset LD_PRELOAD; julia'
again at the end of .bashrc and then type jl to start Julia.
And you should NOT delete:
# >>> juliaup initialize >>>
# !! Contents within this block are managed by juliaup !!
case ":$PATH:" in
*:/home/USERNAME/.juliaup/bin:*)
;;
*)
export PATH=/home/USERNAME/.juliaup/bin${PATH:+:${PATH}}
;;
esac
# <<< juliaup initialize <<<
where USERNAME is your user name.