I have installed Kubuntu 14.04 with an encrypted home directory. Although I had swap set up during the install, the swap space was not there after installing. This has happened to many people, there seems to be a bug somewhere. I googled and found a solution to this here.
I followed the steps there, leaving out the ones that had to do with resume, because that is disabled on my install anyway. So I essentially did:
sudo swapoff -a (turns off swap) comment existing swap configuration in /etc/crypttab comment existing swap configuration in /etc/fstab re-format swap partition with gparted as linux-swap sudo mkswap /dev/sdXX sudo swapon /dev/sdXX sudo ecryptfs-setup-swap
Then I had a working swap and was happy, until I rebooted my laptop and was back to square one. Looking at the partition with gparted, it says file system unknown for the (former) swap partition, and needless to say I don't have any swap space available.
So, now my question is: Why did the file system formatting (as linux-swap) not survive the reboot? Is there anything I can do about that?
If I do blkid, the swap partition does not show up at all, so my problem seems to be different from this question.
Edit: Still working on it, so I did the above procedure again, after which /etc/crypttab looks like this:
cryptswap1 UUID=xxxx /dev/urandom swap,cipher=aes-cbc-essiv:sha256
plus some lines that are commented out. And /etc/fstab contains this line:
/dev/mapper/cryptswap1 none swap sw 0 0
Both new lines however look exactly the same (apart from the UUID) as what was generated the last two times. So I don't have great hopes that it will stay when I reboot. Gparted now shows the partition I am using as linux-swap. (Before rebooting) Also blkid gives this line:
/dev/sda7: UUID="xxxx" TYPE="swap"
I tested the swap and it works, i.e. I started a program that used a lot of memory and checked how much was loaded into swap in the system monitor.
Edit2: Turns out that 3 is not the magic number that fixes this issue. The content of the two files is unchanged, blkid does not show the line with /dev/sda7 anymore and gparted shows the swap partition as "unknown".
Any suggestions the output of what I could look at or what else I could try are really welcome. My workaround at the moment is to just not reboot, but sometimes when there is an update, my laptop really wants to reboot.
Edit3: Is there really nothing else one could try to fix this? Any commands I could try? Any output I could look at?