Comment 4 for bug 1593293

I have the problem too on ubuntu 16.04.

To reproduce:

sudo lsmod | grep brd :
(nothing) : it is builtin

sudo modprobe brd rd_size=123456

sudo mkfs.ext4 /dev/ram0

sudo mount /dev/ram0 /var/cache/ramdisk/

df -m | grep ramdisk :

/dev/ram0 58 2 53 3% /var/cache/ramdisk

 -> useless

Regards.