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I have installed Ubuntu 14.04 on my 16 gb usb drive.When i connect it to my laptop it boot properly and i can use,update and install any package on usb drive.But when i connect to other computer it cant boot.

Kristopher Ives
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Sachin Shukla
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  • Check this: [How to install grub on usb flash drive?](http://askubuntu.com/q/10571) – Jonas Czech Jun 25 '16 at 15:48
  • What does mean «can't boot»? Does it show errors, black screen, or a BIOS message «No operating system found»? Also, note: USB sticks usually have reeealy slow IO, so to have a usable system you'd need to move `/var/log` to tmpfs, and disable *atime*. That's a bare minimum I recall, there's probably more could be done. – Hi-Angel Jun 25 '16 at 19:56
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    Possible duplicate of [How to install grub on usb flash drive?](https://askubuntu.com/questions/10571/how-to-install-grub-on-usb-flash-drive) – Kristopher Ives Sep 08 '19 at 09:54
  • Possible duplicate of [How do I install Ubuntu to a USB key? (without using Startup Disk Creator)](https://askubuntu.com/questions/16988/how-do-i-install-ubuntu-to-a-usb-key-without-using-startup-disk-creator/942312#942312) – sudodus Sep 08 '19 at 10:10

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This is likely due to the fact the bootloader was installed to the hard drive of the system and not to the usb. Open a terminal, and type sudo fdisk -l (your USB flash drive should show up in the list if it is inserted). Now, type sudo grub-install /dev/<insert usb drive name here> to install it on your usb drive.

for example:

sudo grub-install /dev/ubuntuusb

If you labelled your usb device ubuntuusb. Be careful to select the right device or you could inadvertantly destroy another operating systems bootloader. Hope this helps.

Matt
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