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[jean-christophe manciot <manciot.jeanchristophe@xxxxxxxxx>]

I've ruled out "nofail" & "0 0"; it seems that you are able to evade the
issue by using "mapper". I don't know what it is.

Could you try booting your system (is it Ubuntu server 15.10?) with the same fstab style, but with your own partitions?
# / was on /dev/sda4 during installation
UUID=15417b2e-0521-486c-8dc0-9739a4b35c47 /               				ext4    errors=remount-ro 0       1

# /boot/efi was on /dev/sda3 during installation
UUID=E48C-DDA6  /boot/efi                                 				                        vfat    umask=0077      0       1

# swap was on /dev/sda6 during installation
UUID=4870beef-bb2c-40c1-91da-f1444f90c51b none            				swap    sw,nofail,pri=2 0	     0

# swap on SSD Samsung
UUID=fa2b8ce4-6ce7-4fb2-ac12-475264bed20f none            				swap    sw,nofail,pri=1  0       0

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Touch seeded packages, which is subscribed to util-linux in Ubuntu.
https://bugs.launchpad.net/bugs/1516225

Title:
  Swapon does not respect fstab priorities order

Status in util-linux package in Ubuntu:
  Invalid

Bug description:
  uname -a
  Linux msi-ge60-ubuntu 4.2.0-18-generic #22-Ubuntu SMP Fri Nov 6 18:25:50 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

  
  sudo swapon --summary
  Filename				        Type		Size	                Used	Priority
  /dev/sdc2                              	partition	50331644	0	        -1
  /dev/sda6                              	partition	50331644	0	        -2

  However, in /etc/fstab:
  # swap was on /dev/sda6 during installation
  UUID=4870beef-bb2c-40c1-91da-f1444f90c51b none            				swap    sw,nofail,pri=-1  0       0

  # swap on SSD Samsung  /dev/sdc2
  UUID=fa2b8ce4-6ce7-4fb2-ac12-475264bed20f none            				swap    sw,nofail,pri=-2  0       0

  Does the fact that sdc2 is a SSD makes swapon override the fstab priorities? 
  It is suspicious that swapon prints sdc2 first in the summary. despite the following facts:
  - sdc2 priority is -2 in fstab
  - sdc2 is declared after sda2 in fstab
  - sdc2 is after sda2 in alphabetical order

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