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.
Regarding the standard home encryption provided by Ubuntu, you can
sudo ls -lA /home/username/
and if you get something like
totale 0
lrwxrwxrwx 1 username username 56 2011-05-08 18:12 Access-Your-Private-Data.desktop -> /usr/share/ecryptfs-utils/ecryptfs-mount-private.desktop
lrwxrwxrwx 1 username username 38 2011-05-08 18:12 .ecryptfs -> /home/.ecryptfs/username/.ecryptfs
lrwxrwxrwx 1 username username 37 2011-05-08 18:12 .Private -> /home/.ecryptfs/username/.Private
lrwxrwxrwx 1 username username 52 2011-05-08 18:12 README.txt -> /usr/share/ecryptfs-utils/ecryptfs-mount-private.txt
then the username's home directory is encrypted. This works when username is not logged in, so the partition is not mounted. Otherwise you can look at mount output.
About the swap, do
sudo blkid | grep swap
and should check for an output similar to
/dev/mapper/cryptswap1: UUID="95f3d64d-6c46-411f-92f7-867e92991fd0" TYPE="swap"
