Fix for making bootable Ubuntu Live USB with persistence using Unetbootin on a Mac

[turbolego]

I can't get this to work, i'm stuck at "write".

Please advice.

diskutil list

sudo fdisk -e /dev/rdisk2

Password:
fdisk: could not open MBR file /usr/standalone/i386/boot0: No such file or directory
Enter 'help' for information
fdisk: 1> f 1
Partition 1 marked active.
fdisk:*1> write
Device could not be accessed exclusively.
A reboot will be needed for changes to take effect. OK? [n] y
Writing MBR at offset 0.

If i select y:

sudo dd conv=notrunc bs=440 count=1 if=mbr.bin of=/dev/disk2
dd: /dev/disk2: Resource busy

[Quackers]

Does the USB device show up on your desktop? If so run the unmount command first.

[turbolego]

i'm still getting "Resource busy"

/dev/disk2 #: TYPE NAME SIZE IDENTIFIER
0: FDisk_partition_scheme *8.4 GB disk2
1: DOS_FAT_32 UNTITLED 8.4 GB disk2s1
TURBOLEGOs-MacBook-Pro:mbr TURBOLEGO$ diskutil unmountDisk /dev/disk2
Unmount of all volumes on disk2 was successful
TURBOLEGOs-MacBook-Pro:mbr TURBOLEGO$ sudo fdisk -e /dev/rdisk2
fdisk: could not open MBR file /usr/standalone/i386/boot0: No such file or directory
Enter 'help' for information
fdisk: 1> f 1
Partition 1 marked active.
fdisk:*1> write
Writing MBR at offset 0.
fdisk: 1> exit
TURBOLEGOs-MacBook-Pro:mbr TURBOLEGO$ sudo dd conv=notrunc bs=440 count=1 if=/Users/TURBOLEGO/Desktop/oculus/syslinux-6.02/bios/mbr/mbr.bin of=/dev/disk2
dd: /dev/disk2: Resource busy
TURBOLEGOs-MacBook-Pro:mbr TURBOLEGO$

i tried reformatting it in disk utility too, same error.
should i partition it in some special way?

[Quackers]

Does the USB device appear on your desktop?

[turbolego]

yup, seems like i had to unmount it twice... seems to be working now.

transcript:

/dev/disk2 #: TYPE NAME SIZE IDENTIFIER
0: FDisk_partition_scheme *8.4 GB disk2
1: DOS_FAT_32 UNTITLED 8.4 GB disk2s1
TURBOLEGOs-MacBook-Pro:mbr TURBOLEGO$ diskutil unmountDisk /dev/disk2
Unmount of all volumes on disk2 was successful
TURBOLEGOs-MacBook-Pro:mbr TURBOLEGO$ sudo fdisk -e /dev/rdisk2
fdisk: could not open MBR file /usr/standalone/i386/boot0: No such file or directory
Enter 'help' for information
fdisk: 1> f 1
Partition 1 marked active.
fdisk:*1> write
Writing MBR at offset 0.
fdisk: 1> exit
TURBOLEGOs-MacBook-Pro:mbr TURBOLEGO$ sudo dd conv=notrunc bs=440 count=1 if=/Users/TURBOLEGO/Desktop/oculus/syslinux-6.02/bios/mbr/mbr.bin of=/dev/disk2
dd: /dev/disk2: Resource busy
TURBOLEGOs-MacBook-Pro:mbr TURBOLEGO$ diskutil unmountDisk /dev/disk2
Unmount of all volumes on disk2 was successful
TURBOLEGOs-MacBook-Pro:mbr TURBOLEGO$ sudo dd conv=notrunc bs=440 count=1 if=/Users/TURBOLEGO/Desktop/oculus/syslinux-6.02/bios/mbr/mbr.bin of=/dev/disk2
1+0 records in
1+0 records out
440 bytes transferred in 0.003603 secs (122121 bytes/sec)
TURBOLEGOs-MacBook-Pro:mbr TURBOLEGO$

thanks!

[Quackers]

That's better

[turbolego]

I got persistence working now, but now everything is very slow and choppy at times.

Is there a reason for this?

Will persistence make everything slower?

[sudodus]

A persistent live system is slower than a live system without persistence. You can compensate for that by using a fast pendrive. See these links

https://help.ubuntu.com/community/In...#Prerequisites

Link to USB 2 and USB 3 speed tests for installers

[Quackers]

I got persistence working now, but now everything is very slow and choppy at times.

Is there a reason for this?

Will persistence make everything slower?

Yes, USB devices are slower than hard drives - sort of. Especially if using USB2 devices.
It's not as slow as having to do all previously done changes over again

See sudodus' post above.

[turbolego]

welp... i got only usb2... so i`m gonna get my firewire drive then, at least that`s faster.