Same problem. Clean install of Ubuntu Mate 18.04.2. Installed virtualbox-guest-dkms-hwe and virtualbox-guest-utils-hwe OK. When I tried to install virtualbox-guest-x11-hwe this failed, log attached.
Same problem. Clean install of Ubuntu Mate 18.04.2. Installed virtualbox- guest-dkms- hwe and virtualbox- guest-utils- hwe OK. When I tried to install virtualbox- guest-x11- hwe this failed, log attached.