How to install Snaps with Ubuntu 16.04 on a custom kernel?

Question

I can not install any Snap packages in Ubuntu 16.04 due to mounting snap core error. I have found the problem to be caused by using a custom kernel on Ubuntu. My kernel is a modified 4.4.0.20-36 for Surface Pro. The output of any snap command is as follows:

$ sudo snap install notes
error: cannot perform the following tasks:
- Mount snap "core" (3604) ([start snap-core-3604.mount] failed with 
exit status 1: Job for snap-core-3604.mount failed. See "systemctl 
status snap-core-3604.mount" and "journalctl -xe" for details.
)

Output of systemctl status snap-core-3604.mount:

snap-core-3604.mount - Mount unit for core
   Loaded: loaded (/etc/systemd/system/snap-core-3604.mount; enabled; 
vendor preset: enabled)
   Active: failed (Result: timeout) since Sat 2017-12-16 22:22:23 
AEDT; 17min ago
    Where: /snap/core/3604
     What: /var/lib/snapd/snaps/core_3604.snap
   CGroup: /system.slice/snap-core-3604.mount
           └─7380 /bin/mount /var/lib/snapd/snaps/core_3604.snap 
/snap/core/3604 -t squashfs -o nodev,ro

Dec 16 22:17:52 rahn-Surface-Pro-3 systemd[1]: Mounting Mount unit for 
core...
Dec 16 22:19:22 rahn-Surface-Pro-3 systemd[1]: snap-core-3604.mount: 
Mounting timed out. Stopping.
Dec 16 22:20:53 rahn-Surface-Pro-3 systemd[1]: snap-core-3604.mount: 
Mounting timed out. Killing.
Dec 16 22:22:23 rahn-Surface-Pro-3 systemd[1]: snap-core-3604.mount: 
Mount process still around after SIGKILL. Ignoring.
Dec 16 22:22:23 rahn-Surface-Pro-3 systemd[1]: Failed to mount Mount 
unit for core.
Dec 16 22:22:23 rahn-Surface-Pro-3 systemd[1]: snap-core-3604.mount: 
Unit entered failed state.

Answer 1

It’s because (afaik) upstream Linux sources don’t work with confinements. You could find the corresponding patch from Ubuntu mainline kernel and build kernel with this patch. Also, is there really no other kernel that will suit your needs and allow you to mount snaps?