UPDATE:

The last 2 line of my dmesg file were:
# dmesg|tail -2
[ 6202.834745] zram: Creating 1 devices ...
[ 6203.394159] Adding 447752k swap on /dev/zram0.  Priority:5 extents:1 
across:447752k SS

Running the following gave me this:
cat  /proc/swaps 
Filename                                Type            Size    Used    Priority
/dev/dm-0                               partition       2048252 2820    -1
/dev/zram0                              partition       447752  20      5
so it looked like zram was running. 

However, after a reboot the zram entry was missing from /proc/swaps file. It 
looks like the service is running:
# sudo service zramswap status
zramswap start/running
but not providing any swap. I did try running:
# update-rc.d zramswap defaults
which gave an error about missing LSB information and so doesn't work.

I found that if I stop and restart the zram service:
# service zram stop
# service zram start
then everything appears to work OK UNTIL THE NEXT REBOOT ONLY.

Note that I ran all the above commands as root.

Apologies. This is now beyond me!

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https://bugs.launchpad.net/bugs/996535

Title:
  package zram-config 0.1 failed to install/upgrade: subprocess
  installed post-installation script returned error exit status 1

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