Now  our solution -> provided for *systemd* computers:

*/etc/fstab*

# LABEL=COMMON-SWAP      none   swap    sw              0       0

uncomment swap-volume only!


*/etc/crypttab*

# <target name> <source device>         <key file>      <options>
cryptswap1 LABEL=COMMON-SWAP /dev/urandom 
swap,cipher=aes-cbc-essiv:sha256,offset=8,noauto

Required are *offset=8* - otherwise the given basis (swap-volume) will
be destroid!  For testing purpose only the *LABEL* definition has been
used.


*/etc/rc.local* (extension modul)

/sbin/cryptdisks_start cryptswap1
/bin/sleep 5
/sbin/swapon /dev/mapper/cryptswap1


Comments: -> */bin/sleep 5* -> t.b.d. - depends on volume / GiB to be crypted.

*/etc/rc.local* -> will be started from
*/lib/systemd/system/rc.local.service* and provides:

root@USB-GNOME:~# blkid | grep COMMON-SWAP
/dev/sdb1: LABEL="COMMON-SWAP" UUID="c939105e-bae2-437e-9d0c-affac8e959ea" 
TYPE="swap" 
   PARTUUID="2f299a37-e690-447e-91a3-917d2c0161c9"
root@USB-GNOME:~# swapon -s
Filename                        Type            Size     Used   Priority
/dev/dm-0                       partition       8519672  0      -1

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https://bugs.launchpad.net/bugs/1310058

Title:
  ecryptfs-setup-swap hints after reboot

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