It works after the first reboot:

tester@tester-SATELLITE-PRO-C850-19W:~$ sudo lsblk -fm              # overview in maximized terminal window
[sudo] password for tester: 
NAME           FSTYPE  LABEL              UUID                                 MOUNTPOINT NAME             SIZE OWNER GROUP MODE
sda                                                                                       sda            111,8G root  disk  brw-rw----
├─sda1         ext4                       83d69642-c887-41d4-8a7c-d58695581abf /          ├─sda1         107,9G root  disk  brw-rw----
├─sda2                                                                                    ├─sda2             1K root  disk  brw-rw----
└─sda5         swap                       4beb7e30-2af0-484c-9f85-43cab59edaa4            └─sda5           3,9G root  disk  brw-rw----
  └─cryptswap1 swap                       b7016aa6-024e-4f36-992c-664dd42fdc48 [SWAP]       └─cryptswap1   3,9G root  disk  brw-rw----
sdb            iso9660 Lubuntu 15.04 i386 2015-03-11-17-27-36-00                          sdb              3,7G root  disk  brw-rw----
└─sdb1         iso9660 Lubuntu 15.04 i386 2015-03-11-17-27-36-00                          └─sdb1           695M root  disk  brw-rw----
sr0                                                                                       sr0             1024M root  cdrom brw-rw----
tester@tester-SATELLITE-PRO-C850-19W:~$ uname -a
Linux tester-SATELLITE-PRO-C850-19W 3.19.0-9-generic #9-Ubuntu SMP Wed Mar 11 17:50:01 UTC 2015 i686 i686 i686 GNU/Linux
tester@tester-SATELLITE-PRO-C850-19W:~$ leafpad dialogue.txt&
[1] 1368
tester@tester-SATELLITE-PRO-C850-19W:~$
_______________________________________________

After the second reboot cryptswap is gone:

tester@tester-SATELLITE-PRO-C850-19W:~$ sudo lsblk -fm              # overview in maximized terminal window
[sudo] password for tester: 
NAME   FSTYPE  LABEL              UUID                                 MOUNTPOINT NAME     SIZE OWNER GROUP MODE
sda                                                                               sda    111,8G root  disk  brw-rw----
├─sda1 ext4                       83d69642-c887-41d4-8a7c-d58695581abf /          ├─sda1 107,9G root  disk  brw-rw----
├─sda2                                                                            ├─sda2     1K root  disk  brw-rw----
└─sda5                                                                            └─sda5   3,9G root  disk  brw-rw----
sdb    iso9660 Lubuntu 15.04 i386 2015-03-11-17-27-36-00                          sdb      3,7G root  disk  brw-rw----
└─sdb1 iso9660 Lubuntu 15.04 i386 2015-03-11-17-27-36-00                          └─sdb1   695M root  disk  brw-rw----
sr0                                                                               sr0     1024M root  cdrom brw-rw----
tester@tester-SATELLITE-PRO-C850-19W:~$ swapon -s
tester@tester-SATELLITE-PRO-C850-19W:~$ leafpad dialogue.txt&
[1] 1338
tester@tester-SATELLITE-PRO-C850-19W:~$ /usr/share/themes/Lubuntu-default/gtk-2.0/apps/thunar.rc:55: error: invalid string constant "thunar-statusbar", expected valid string constant

tester@tester-SATELLITE-PRO-C850-19W:~$