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If you want to boot your Librem 5 from software loaded via USB (e.g. if your install on the eMMC drive is broken, or you want to perform a backup of the eMMC drive) then you will **need** the `uuu` tool and, for the specific examples noted here, you will _also_ need Jumpdrive.
These instructions tell you how to _build_ those two pieces of software.
In theory, if you have two phones, you might be able to do this from a working phone - and these instructions are **not** for that use case. The assumption is that you are doing this from an x86 computer (`amd64` architecture).
The procedure here may be time-consuming. However you should only need to do it once.
Since `uuu` is a prerequisite to _use_ Jumpdrive, I will build `uuu` first.
These instructions are for Ubuntu 20.04 but should point you in the right direction for other Linux distros.
## Disclaimer
No-one's install of Ubuntu will exactly match mine. Your starting point may be different from mine.
I am putting all my `git` stuff in a subdirectory of my home directory called `git`. Feel free to vary that as you see fit. Path references should be relative, so it should work if you do something different.