Ubuntu – Problem installing luks to sdb2 dual boot

luks

Been following the instructions given in this askubuntu answer How can I install Ubuntu encrypted with LUKS with dual-boot?

I can get as far as step # 7: vcreate -l 100%FREE -n mint_root vgmint

When i get Logical Volume "mint_root" already exists in group "vgmint"

Ive been following the instructions to the T but for changing my partition labels.

Id ask the person whos answer im following but lack the whatever to comment.

In response to comment: actually im installing ubuntu. Just coppied the wrong command. It happens to be the same command for mint as for ubuntu. Kind of unfortunate that such a thing would be nitpicked and i dont think OP of the thorough answer im refering should remove his complete example of dual booting.

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