Mine

localhost habeeb #  gpasswd -a habeeb vboxusers
Adding user habeeb to group vboxusers
localhost habeeb # su habeeb
habeeb@localhost ~ $ modprobe vboxdrv
bash: modprobe: command not found
habeeb@localhost ~ $ LD_LIBRARY_PATH=. ./VBoxSVC&
[1] 24279
habeeb@localhost ~ $ bash: ./VBoxSVC: No such file or directory

[1]+  Exit 127                LD_LIBRARY_PATH=. ./VBoxSVC
habeeb@localhost ~ $ LD_LIBRARY_PATH=. ./VirtualBox
bash: ./VirtualBox: No such file or directory