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I am new to install ubuntu. I want to install it using boot able usb. My question is how much size usb drive required for making bootable ubuntu operating operating system?

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    You need to write the Ubuntu iso image you download onto it, which is roughly 1.5GB large. So, a 2GB USB stick is enough. – Byte Commander Mar 23 '18 at 9:06
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    You don't really need a USB stick, you can use a cell phone or MP3 player, or etc. – C.S.Cameron Mar 23 '18 at 16:06
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USB drive size 2 GB - Ubuntu live-only

As @ByteCommander indicates, a 2GB USB pendrive or memory card (connected via a USB adapter) will be big enough for a live-only USB boot drive, that you can use to 'Try Ubuntu' or Install Ubuntu into another drive (an internal drive or another USB drive).

There are more details at this link.

USB drive size 4 GB - Ubuntu persistent live

A 4GB USB pendrive or memory card (connected via a USB adapter) will be big enough for a persistent live USB boot drive.

There are more details at this link.

USB drive size 16 GB - Ubuntu installed system

A 16GB USB pendrive or memory card (connected via a USB adapter) will be big enough for an installed system in a USB boot drive (installed like into an internal drive).

There are more details at this link.

General link

Try Ubuntu (Kubuntu, Lubuntu, Xubuntu, ...) before installing it

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It must be minimum 2 GB. You can follow tutorials on Official Ubuntu Installation Page.

https://tutorials.ubuntu.com/tutorial/tutorial-create-a-usb-stick-on-windows

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