Guest platform: slackware 14.2
Video adapter set to VMSVGA does not work (screen is all black), VBoxVGA and VBoxSVGA seem to work
Guest additions compile fine (Slackware was installed with the "D" series for development tools gcc, perl, make etc.)
After building the guest additions:root@phobos:~# /mnt/VBoxLinuxAdditions.run Verifying archive integrity... All good. Uncompressing VirtualBox 6.0.0_BETA3 Guest Additions for Linux........ VirtualBox Guest Additions installer Copying additional installer modules ... Installing additional modules ... VirtualBox Guest Additions: Building the VirtualBox Guest Additions kernel modul es. This may take a while. VirtualBox Guest Additions: To build modules for other installed kernels, run VirtualBox Guest Additions: /sbin/rcvboxadd quicksetup <version> VirtualBox Guest Additions: Building the modules for kernel 4.4.14. VirtualBox Guest Additions: Starting.
File Manager works fine: after creating a sessionroot@phobos:/home/stes# lsmod | grep vbox vboxvideo 33358 0 vboxsf 34660 0 ttm 81822 2 vmwgfx,vboxvideo drm_kms_helper 118940 2 vmwgfx,vboxvideo drm 322902 5 ttm,drm_kms_helper,vmwgfx,vboxvideo vboxguest 295673 2 vboxsf
root@phobos:/home/stes# ps -ef | grep VBox root 557 2 0 20:29 ? 00:00:00 [iprt-VBoxWQueue] root 1083 1 0 20:29 ? 00:00:00 /usr/sbin/VBoxService --pidfile /var/run/vboxadd-service.sh stes 1122 1083 0 20:30 ? 00:00:00 /opt/VBoxGuestAdditions-6.0.0_BETA3/sbin/VBoxService guestsession --session-id=1 --session-proto=2 --user stes root 1135 1117 0 20:31 pts/0 00:00:00 grep VBox