When I try to install vbox guest additions on Oracle Linux 6.8
Failed to set up service vboxadd, please check the log file
/var/log/VBoxGuestAdditions.log for details.
There are many ways to fix this – here’s one way that works for me with Oracle Linux 6.8
yum install gcc
yum install make
yum install kernel-uek-devel
# now restart the VM and then re-install vbox guest additions