To make Kali Live persistent, create a new ext4 partition, make a filesystem labelled “persistence”, create a file named “persistence.conf” with the text “/ union”.
commands:
# lsblk
create new primary partition on sdb2’s free space, write the changes and quit cfdisk
# cfdisk /dev/sdb (cfdisk is curses fdisk)
# mkfs.ext4 -L persistence /dev/sdb3 – make an ext4 filesystem on sdb3
# e2label /dev/sdb3 persistence – label with “persistence”
create the configuration file
# mkdir -p /mnt/my_usb
# mount /dev/sdb3 /mnt/my_usb
#echo “/ union” > /mnt/my_usb/persistence.conf
#umount /dev/sdb3
done