找到 /opt/VBoxGuestAdditions-6.0.4/src/vboxguest-6.0.4/vboxsf/vfsmod.c,将
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 3, 0)
# include <linux/mount.h>
#endif
修改成
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 0, 0)
# include <uapi/linux/mount.h> /* for MS_REMOUNT */
#elif LINUX_VERSION_CODE < KERNEL_VERSION(3, 3, 0)
# include <linux/mount.h>
#endif
即可。