λ ~/  % cat /etc/fstab 
# / was on /dev/sda6 during installation
UUID=67c6db84-4fbf-4a6d-bbc7-827add849f5b /               ext4    errors=remount-ro 0       1
# swap was on /dev/sda7 during installation
#UUID=1b5ef65e-fd3d-4cd2-87fd-b5012c3c6391 none            swap    sw              0       0
/dev/mapper/cryptswap1 none swap sw 0 0
λ ~/  % blkid
/dev/sda1: LABEL="System-reserviert" UUID="2C28B53128B4FAC2" TYPE="ntfs" PARTUUID="24bfa373-01"
/dev/sda2: UUID="E82881082880D6CA" TYPE="ntfs" PARTUUID="24bfa373-02"
/dev/sda5: UUID="8301a2ca-b83f-48ea-85a7-ce28ce7dc75f" TYPE="ext4" PARTUUID="24bfa373-05"
/dev/sda6: UUID="67c6db84-4fbf-4a6d-bbc7-827add849f5b" TYPE="ext4" PARTUUID="24bfa373-06"
/dev/sda7: UUID="1b5ef65e-fd3d-4cd2-87fd-b5012c3c6391" TYPE="swap" PARTUUID="24bfa373-07"
/dev/mapper/cryptswap1: UUID="09cac1ee-0854-41d7-ba83-a9376a798dc2" TYPE="swap"
λ ~/  %

## plan
1) mount sda5
2) cp -R / /mnt/sda5
3) change /mnt/sda5/etc/fstab for new root partition
3) update grub, so grub will detect sda5 and will allow to boot from it