The following changes were made:

* removed mounting tmp filesystems from user (now done by snap)
  * split off separate doc package
  * Added package name override to prevent duplicated version string in name
  * removed version string from file name (Makefile.linux-headers)

SNAP/usher

@@ -7,37 +7,15 @@ case $1 in
     exit 0
     ;;
   postinst)
-    KERNEL_VER=`ls -C1rt ${TARGET}/boot/vmlinuz*|sed 's/.*vmlinuz-//'`
-
     if [[ ${TARGET} ]]; then
-      echo "Running within ${TARGET} for kernel $KERNEL_VER"
+      echo "Running within ${TARGET} for kernel ${VERSION}"
 
-      if ! mountpoint -q ${TARGET}/dev; then
-        mount -t devtmpfs none ${TARGET}/dev
-      fi
-      if ! mountpoint -q ${TARGET}/proc; then
-        mount -t proc none ${TARGET}/proc
-      fi
-      if ! mountpoint -q ${TARGET}/sys; then
-        mount -t sysfs none ${TARGET}/sys
-      fi
-
-      chroot ${TARGET} /bin/bash -c "/sbin/mkinitramfs $KERNEL_VER"
-      chroot ${TARGET} /bin/bash -c \
-        "/sbin/grub-mkconfig -o /boot/grub/grub.cfg"
-
-      if mountpoint -q ${TARGET}/dev; then
-        umount ${TARGET}/dev
-      fi
-      if mountpoint -q ${TARGET}/proc; then
-        umount ${TARGET}/proc
-      fi
-      if mountpoint -q ${TARGET}/sys; then
-        umount ${TARGET}/sys
-      fi
+      chroot ${TARGET} mkinitramfs ${VERSION}
+      chroot ${TARGET} grub-mkconfig -o /boot/grub/grub.cfg
     else
-      echo "Running for kernel $KERNEL_VER"
-      mkinitramfs $KERNEL_VER
+      echo "Running for kernel ${VERSION}"
+
+      mkinitramfs ${VERSION}
       grub-mkconfig -o /boot/grub/grub.cfg
     fi
     ;;