Question: How do I check if a partition is encrypted? In particular I would like to know how I check if `/home` and swap is encrypted.

Answer: 
In addition to the answer provided by enzotib, there's the possibility of full disk encryption as provided by the alternate installer. (Also called LUKS-crypt.)

You can use `sudo dmsetup status` to check if there are any LUKS-encrypted partitions. The output should look something like:

```
ubuntu-home: 0 195305472 linear 
ubuntu-swap_1: 0 8364032 linear 
sda5_crypt: 0 624637944 crypt 
ubuntu-root: 0 48824320 linear

```

The line marked "crypt" shows that sda5 has been encrypted. You can see which filesystems are on that via the lvm tools.

In the case of LUKS encryption, the Disk Utility in Ubuntu will also show the encryption layer and the configuration in a graphical manner.
To check the encrypted swap status and cipher details, use this cmd:

```
$ sudo cryptsetup status /dev/mapper/cryptswap1
/dev/mapper/cryptswap1 is active and is in use.
  type:    PLAIN
  cipher:  aes-cbc-essiv:sha256
  keysize: 256 bits
  device:  /dev/sda2
  offset:  0 sectors
  size:    8388608 sectors
  mode:    read/write

```

Your swap device name may be different, you can check the proper name by:

```
$ swapon -s
Filename                Type        Size    Used    Priority
/dev/mapper/cryptswap1  partition   4194300 0       -1

```