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Installed ubuntu 20.04 on a usb stick then used that to create a full ubuntu installation on a usb stick with 3 partitions swap, /boot & ex4 with a "/"
Now the usb stick works well on the same laptop used to install ubuntu but on other machines it does not work it shows a blinking cursor on the left corner with a blank screen please help :)

Mirza Areeb Baig
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    This might happen if one computer is UEFI boot and the other is BIOS boot. See sudodus second reference if this is the problem. You might also need to reinstall GRUB, from the Live USB run: sudo mount /dev/sdxy /mnt then sudo grub-install --boot-directory=/mnt/boot /dev/sdx where sdxy is the root partition of the Full install USB. – C.S.Cameron Aug 06 '20 at 06:08

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There can be different causes of this problem:

  • You installed the bootloader into the internal drive. This can be avoided if you unplug, disconnect or otherwise disable the internal drive during the installation to the external drive.

  • There is no hardware driver for the other computer(s). This can happen for example if you install a proprietary graphics driver, that does not work in the other computer(s) and blocks the built-in linux driver that should be used.

See the following links,

sudodus
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  • Hey thanks for your answer. I have tried following this but it didn't work still i'm not able to boot full ubuntu with usb stick everything works fine in the machine which i used to install the ubuntu on usb For partitions in usb i have used swap - logical, efi - primary & selecting this as boot loader & ex4 - primary – Mirza Areeb Baig Aug 08 '20 at 04:34
  • @MirzaAreebBaig, Please edit your original question to explain with more details which method you used to install Ubuntu. And the result: what works, and what does not work. And describe the computers where you want to run from the USB drive: brand name and model for each of them. - In other words, please help me help you. – sudodus Aug 08 '20 at 09:22