[18:43] <ad-n770> hi, I'm running an Intel skylake system with Ubuntu 15.10 + kernel 4.4rc7 installed from mainline ppa http://linuxdaddy.com/blog/install-kernel-4-4-on-ubuntu/
[18:44] <ad-n770> I'm facing some strange issue with schroot
[18:44] <ad-n770> unkown filesystem type 'overlayfs'
[18:44] <ad-n770> during the mount stage
[18:45] <ad-n770> I've checked with the stock kernel 4.2 and it works, so it must be somehow tied to 4.4 kernels
[18:46] <ad-n770> could you provide me some hints?
[18:47] <ad-n770> I've also tried with rc5 and rc6 with same results
[18:49] <ad-n770> with lsmod | grep overlay seems that module isn't loaded
[18:49] <ad-n770> cat /proc/filesystems | grep overlay same
[18:50] <ad-n770> modprobe overlay seems to load the module
[18:51] <ad-n770> but I'm still getting the mount problem with schroot
[18:54] <ad-n770> with cat /proc/filesystems | grep overlay I'm only getting overlay and not overlayfs after modprobe overlay
[19:08] <ad-n770> also reproducible with 4.3.3 kernel from ppa
[20:07] <simosx> ad-n770, I think there has been a renaming for the kernel module, between overlayfs and overlay. The scripts should work, as "overlayfs" is an alias for "overlay". However, it's possible that somewhere this aliasing may not work. 
[20:27] <ad-n770> you were right, at the end I've just needed to change my schroot file at /etc/schroot/chroot.d/
[20:54] <apw> ad-n770, yes you are trying to use the "compatible with older kernels" overlayfs, if you don't have V1 suport you have to use V2 (overlay)