First off, I did not reboot and would not like to, it's a server.It is running Debian Jessie 8.4 with kernel 3.16.0-4-amd64.I followed these steps:apt-get install cryptsetup -> no problemswapoff /dev/sda5 -> no problemdd if=/dev/zero of=/dev/sda5 -> I don't know if it is a problem or notdd: writing to /dev/sda5: No space left on device  33173505+0 records in  33173504+0 records out  16984834048 bytes (17 GB) copied, 424.082 s, 40.1 MB/s  I edited /etc/crypttab to contain  swap /dev/sda5 /dev/random swapservice cryptdisks restart -> problemFailed to restart cryptdisks.service: Unit cryptdisks.service is masked.service cryptdisks reload -> this worked, but no effect, see belowI edited /etc/fstab to contain/dev/mapper/swap none swap defaults 0 0I did not reboot.service cryptdisks status -> problemcryptdisks.service  Loaded: masked (/dev/null)  Active: inactive (dead)  swapon -s gives empty resultEDIT1:These 2 steps finally worked for memkswap -f /dev/mapper/swap -v1swapon /dev/mapper/swapOne question remains: Did I do it all alright? I mean how do I check if it contains encrypted data?
Unable to activate new encrypted swap partition
encryption;swap