Just to preface: I'm pretty new to VirtualBox and Linux, so please bare with me. I just downloaded the CentOS 8 DVD ISO image, installed it on a VM in VirtualBox and it appears to function correctly, minus the guest additions which is supposed to fix mouse/screen issues(?). In the terminal window I have executed the following commands:

sudo yum install gcc
sudo yum install make perl
sudo yum install kernel-devel
sudo yum install elfutils-libelf-devel

All of these appear to have completed successfully, and I then attempt to install guest additions and I see the following in the attached image at https://ibb.co/JsnW1ZD. This was my second attempt to install the additions which is why I believe it's saying it's removing the installed version of them. The first time I attempted the same basic errors/information was generated. I've been fighting with this for a good while now and am pretty frustrated. I just want my VM to work so I can learn the OS, and this is super discouraging. I have also attempted to just remove the VM and install again from fresh and end up with the same result.

Thanks for any help you guys can provide.

As the error message says, you need to install kernel headers, i.e. the kernel-headers package. A quick internet search provides several sites with instructions; crucially, you need steps to ensure that it is the right version of kernel-headers.

Thanks for the reply, much appreciated! I attempted to startup my VM to check this and for some reason I kept getting stopped prior to CentOS loading(didn't save the error, apologies). I decided to just do a fresh install of the VM and I keep getting stopped now at the following: https://ibb.co/g3Nj0n1 and when I try to do 'test media and install' I get https://ibb.co/f8Hq5n4. I then attempted a complete uninstall/reinstall of VirtualBox and a fresh download of the installation ISO from the same place I got it originally(and was originally successful at creating a VM minus the guest additions) at the official CentOS page http://mirror.twinlakes.net/centos/8...4/isos/x86_64/ (using the DVD ISO btw). Still ends up with the same errors in the above screenshots.

I am, however, able to spin up a VM using the exact same ISO in Hyper-V and so far have encountered no issues. It is perhaps worth noting that the issues in VirtualBox(unrelated to the guest additions) didn't start occurring until after I created the VM in Hyper-V, although I'm unsure how the two would be related in this case.

Haven't tried this one:

https://www.if-not-true-then-false.c...-red-hat-rhel/

However in the past, content from this website has been onpoint.

thanks

Thanks for that info, and I'd love to give it a try, however I can't even get CentOS 8 to install in VirtualBox now, I always encounter the issues I mentioned in the post above. I can't imagine why the same ISO worked previously and now it doesn't.