MarsSeed [1] filed a deletion request for virtualbox-ext-oracle-5 [2]: VirtualBox 5.2 is EOL since July 2020. Fails to build kernel module on Linux 5.8 and up. AUR packages for virtualbox 5.0 and 5.2 got deleted recently. I suggest the same for this legacy extension package. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/virtualbox-ext-oracle-5/