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First time this ever happened with a Ubuntu release, I get a disc check each time I boot to a USB drive to Try Ubuntu 20.04.

Is because of the way the USB drive is formatted (NTSC) or the tool I used to create the bootable USB drive (Universal-USB-Installer)?

Or is there something I can change in Ubuntu 20.04 to stop this?

High Pitch Eric
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1 Answers1

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Removing Disk Check on Persistent USB's

The command line option fsck.mode=skip can be used to skip the disk check.

The line Checking disks: 0% complete will still come up but fsck will not be run, nor will boot time be increased.

mkusb After the Persistent USB drive is created, open /boot/grub/grub.cfg as root.

  • Add fsck.mode=skip to the Persistent menuentry thus:

linux ($root)/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed maybe-ubiquity fsck.mode=skip quiet splash persistent ---

  • Newer versions of mkusb already include this fix

  • If you also wish to remove the Try Ubuntu / Install Ubuntu screen delete "maybe-ubiquity".

UNetbootin After creating the boot drive, open /boot/grub/grub.cfg as root.

  • Add fsck.mode=skip to the first menuentry for (UEFI boot mode).

  • Open syslinux.cfg as root and add fsck.mode=skip to the default menuentry for (BIOS boot mode).

Rufus After creating the boot drive, open /boot/grub/grub.cfg as root.

  • Add fsck.mode=skip to the Default menuentry for (UEFI boot mode).

  • Open /isolinux/txt.cfg as root and add fsck.mode=skip to the "Try Ubuntu without installing" menuentry, (for BIOS boot mode).

The Try Ubuntu / Install Ubuntu screen can be removed from BIOS boot by overwriting syslinux.cfg with:

default persistent
label persistent
  say Booting an Ubuntu Persistent session...
  kernel /casper/vmlinuz
  append  file=/cdrom/preseed/ubuntu.seed boot=casper persistent initrd=/casper/initrd quiet splash noprompt --

The Try Ubuntu / Install Ubuntu screen can be removed from Rufus UEFI boot by removing "maybe-ubiquity" from /boot/grub/grub.cfg.

Edit 20200524: The above workaround is no longer needed.

This bug was fixed in the package casper - 1.447, as announced in: https://bugs.launchpad.net/ubuntu/+source/casper/+bug/1875548

Run:

sudo apt-get update
sudo apt-get install -y casper

I am still testing this fix.

C.S.Cameron
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