Updating Kali Linux on USB
The best way to update Kali on a USB is to follow the same way you would on a full install.
First ensure that
etc/apt/sources.list is properly populated.
kali@kali:~$ cat /etc/apt/sources.list deb http://http.kali.org/kali kali-rolling main contrib non-free deb-src http://http.kali.org/kali kali-rolling main contrib non-free kali@kali:~$
After that we can run the following commands which will upgrade us to the latest Kali versions.
kali@kali:~$ sudo apt update kali@kali:~$ kali@kali:~$ sudo apt full-upgrade -y kali@kali:~$
Using this, the kernel will not be updated however. If the kernel is needed to be upgraded, perhaps there is a security vulnerability patched, a re-write would be needed with the latest ISO. If there is data that is needed to be saved, an rsync to a separate storage device would be a good way to backup that data.
Updated on: 2020-Mar-07