Upgrade Ubuntu Feisty to Gutsy, problem SWAP

My swap file was disabled after updrade, solution:

get UUID of the swap partition ex:

sudo vol_id /dev/sda2

output:

D_FS_USAGE=other
ID_FS_TYPE=swap
ID_FS_VERSION=2
ID_FS_UUID=15d63259-800b-4c5d-b459-480013793ec5
ID_FS_UUID_ENC=15d63259-800b-4c5d-b459-480013793ec5
ID_FS_LABEL=
ID_FS_LABEL_ENC=
ID_FS_LABEL_SAFE=


update the line :
UUID=15d63259-800b-4c5d-b459-480013793ec5 none swap sw 0 0
in /etc/fstab
with the correct value for UUID.