2 added missing parameter to update-initramfs
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Encrypted volumes are listed in /etc/crypttab. You need to update that file, to remove the volume that you no longer want mounted.

After doing this, you need to rebuild the initramfs, by running

sudo update-initramfs -u

If you want to have three encrypted partitions on the same disk, then you should have a single encrypted volume instead of three, and create partitions inside it (with LVM: make the encrypted volume a physical volume, create a volume group containing that physical volume, and create a logical volume for /, one for /home and one for swap). Ubuntu's startup scripts don't handle sharing the passphrase between volumes, though you can tweak them to do that; see bug #1022815.

By the way, you can use a random key (generated at each boot) for the swap volume, if you don't use hibernation.

Encrypted volumes are listed in /etc/crypttab. You need to update that file, to remove the volume that you no longer want mounted.

After doing this, you need to rebuild the initramfs, by running

sudo update-initramfs

If you want to have three encrypted partitions on the same disk, then you should have a single encrypted volume instead of three, and create partitions inside it (with LVM: make the encrypted volume a physical volume, create a volume group containing that physical volume, and create a logical volume for /, one for /home and one for swap). Ubuntu's startup scripts don't handle sharing the passphrase between volumes, though you can tweak them to do that; see bug #1022815.

By the way, you can use a random key (generated at each boot) for the swap volume, if you don't use hibernation.

Encrypted volumes are listed in /etc/crypttab. You need to update that file, to remove the volume that you no longer want mounted.

After doing this, you need to rebuild the initramfs, by running

sudo update-initramfs -u

If you want to have three encrypted partitions on the same disk, then you should have a single encrypted volume instead of three, and create partitions inside it (with LVM: make the encrypted volume a physical volume, create a volume group containing that physical volume, and create a logical volume for /, one for /home and one for swap). Ubuntu's startup scripts don't handle sharing the passphrase between volumes, though you can tweak them to do that; see bug #1022815.

By the way, you can use a random key (generated at each boot) for the swap volume, if you don't use hibernation.

1
source | link

Encrypted volumes are listed in /etc/crypttab. You need to update that file, to remove the volume that you no longer want mounted.

After doing this, you need to rebuild the initramfs, by running

sudo update-initramfs

If you want to have three encrypted partitions on the same disk, then you should have a single encrypted volume instead of three, and create partitions inside it (with LVM: make the encrypted volume a physical volume, create a volume group containing that physical volume, and create a logical volume for /, one for /home and one for swap). Ubuntu's startup scripts don't handle sharing the passphrase between volumes, though you can tweak them to do that; see bug #1022815.

By the way, you can use a random key (generated at each boot) for the swap volume, if you don't use hibernation.