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I'm trying to turn live USB into live USB with persistent memory. I'm following this procedure. The procedure says to "Add a Space and persistent after quiet splash --- in the following files" and specifies three files:

/isolinux/txt.cfg

/syslinux.cfg


/boot/grub/grub.cfg

The problem is that I cannot find those files.

Any suggestion what to do?

Additional information:

Operating system: Ubuntu 18.04.2 LTS

Note:

Different setup - live-persistent; missing files?? This is live-persistent setup on different USB pendrive and that works just fine. But neither of the files are there.

Different setup - live-persistent; missing files??

BlueSkies
  • 2,365

1 Answers1

4

Changing Live Pendrive to Persistent Pendrive

This works both with BIOS and UEFI.

Many people prefer a Persistent Pendrive that will save changes;

  • Create a Live Pendrive using Rufus or similar;

  • Boot the pendrive toram to make the drive editable:

    Press Shift when booting; press Esc from Language; press F6; press Esc;

    Type a Space and toram after quiet splash ---, and press Enter.

  • Create a casper-rw file:

    sudo dd if=/dev/zero of=casper-rw bs=1M count=512

    sudo mkfs.ext3 -L casper-rw -F casper-rw

(where count=512 is the persistence size in megabytes, with a max of 4GB).

  • Move the new casper-rw file from home to the root of the Live Pendrive;

  • Add a Space and persistent after quiet splash --- in the following files, (pre-22.04):

    /isolinux/txt.cfg, (for BIOS boot persistence Rufus);

    /syslinux.cfg, (for BIOS boot persistence UNetbootin);

    /boot/grub/grub.cfg, (for UEFI boot persistence).

enter image description here File location 20.04 and prior.

  • In Ubuntu 22.04 and later add the word persistent one space after file=/cdrom/preseed/ubuntu.seed in grub.cfg.

enter image description here File location 22.04 and later.

  • Shut down and reboot the persistent drive.

It's also possible to turn a Live USB into a Full-Install USB which has some advantages, except it won't install Ubuntu: Can Ubuntu be installed to the pendrive it was booted from?

Nowadays some Live Ubuntu apps will create Live Persistent USB's, Rufus, Ventoy, mkusb and Universal. Others like Startup Disk Creator, dd, Gnome-Disks and Etcher create ISO9660 based USB and are difficult to make persistent.

C.S.Cameron
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