Failed to load ZFS module stack

Question

Have been using zfs on linux (zfs-native/stable) raidz on 14.04 for several months without hitch and decided to move across some more important files as considered it trustworthy or I guess "stable" (only a recent foray into linux world).

Yesterday I performed an upgrade as a recommendation to fix an error message at ubuntu startup (did not fix) and now find that myzfs pool is no longer. I tried to re-mount and receive this error:

Failed to load ZFS module stack. 
Load the module manually by running 'insmod <location>/zfs.ko' as root. 
Failed to load ZFS module stack. 
Load the module manually by running 'insmod <location>/zfs.ko' as root.

After some websearches I found this solution from dajhorn which I partly attempted.

dkms status
spl, 0.6.3, 3.13.0-29-generic, x86_64: installed
zfs, 0.6.2, 3.13.0-24-generic, x86_64: installed
zfs, 0.6.2, 3.13.0-29-generic, x86_64: installed

As the versions differ I decided to remove zfs 0.6.2 sudo dkms remove -m zfs -v 0.6.2 --all and thought a solution would be to replace with zfs 0.6.3. Is this the right way to go about things still? I am just concerned that dajhorn's post is 2 years old and am absolutely paranoid about losing data.

Alternatively is an approach such as this more suitable/relevant to my problem?

So to sum up, at this stage I removed zfs 0.6.2 and am hoping for some advice on best approach to resolve- should I still trust a 2 year old post or take different approach. Thanks for taking time to read and I hope you are able to help.

Further information:

Install method...

sudo add-apt-repository ppa:zfs-native/stable
sudo apt-get update
sudo apt-get install ubuntu-zfs

apt-cache policy spl spl-dkms ubuntu-zfs zfs-dkms
spl:
  Installed: 0.6.3-1~trusty
  Candidate: 0.6.3-1~trusty
  Version table:
 *** 0.6.3-1~trusty 0
       1001 http://ppa.launchpad.net/zfs-native/stable/ubuntu/ trusty/main amd64 Packages
        100 /var/lib/dpkg/status
spl-dkms:
  Installed: 0.6.3-1~trusty
  Candidate: 0.6.3-1~trusty
  Version table:
 *** 0.6.3-1~trusty 0
       1001 http://ppa.launchpad.net/zfs-native/stable/ubuntu/ trusty/main amd64 Packages
        100 /var/lib/dpkg/status
ubuntu-zfs:
  Installed: 7~trusty
  Candidate: 8~trusty
  Version table:
     8~trusty 0
       1001 http://ppa.launchpad.net/zfs-native/stable/ubuntu/ trusty/main amd64 Packages
 *** 7~trusty 0
        100 /var/lib/dpkg/status
zfs-dkms:
  Installed: 0.6.2-2~trusty
  Candidate: 0.6.3-3~trusty
  Version table:
     0.6.3-3~trusty 0
       1001 http://ppa.launchpad.net/zfs-native/stable/ubuntu/ trusty/main amd64 Packages
 *** 0.6.2-2~trusty 0
        100 /var/lib/dpkg/status

modprobe:  FATAL: Module zfs not found.

============= After

sudo apt-get update; sudo apt-get dist-upgrade

No errors returned and packages all seem to be upgraded (spl 0.6.3-1, spl-dkms 0.6.3-1, ubuntu-zfs 8~trusty, zfs-dkms 0.6.3-3).

Now check:

sudo zpool list no pools available

check: zpool import -d /dev/disk/by-id Everything looks okay.. so I imported. All OK!!

Before ending, am I missing something else that would be worthwhile checking?

Thanks.