Get started with Ubuntu Core

Ubuntu Core docs
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Ubuntu Core has been designed to facilitate the creation, deployment, and management of secure custom images running on your own hardware.

To build an image, you need a Linux host system and one or more target systems. A target system could be a local virtual machine for testing, a single embedded system in your garage, or a fleet devices scattered across the Earth.

Pre-built test images are also available for x86-based PC-style hardware and ARM-based platforms. These are ideal for exploration and experimentation but they’re not intended for deployment or for use at scale.

We have tutorials for all approaches, with a step-by-step guide to creating your own image, plus guides on running Ubuntu Core within a virtual machine or on a variety of x86-based and ARM-based systems.
Build your first Ubuntu Core image
A step-by-step guide to building and testing your own image with your own selection of applications.		 Install and try a pre-built image
Test a pre-built image within a VM, or by installing Ubuntu Core on either x86-based or ARM-based hardware.
2

There is a typo on this page , look for

-netdev ser

It should be

-netdev user

BTW any plan to support non UEFI x86_64 devices ?

cc: @lool

3

Typo fixed, thank you!

1 Like
4

You’re welcome,

I think there is an other doc page that should be fixed,
It miss the UEFI file arg
 or maybe it can just redirect to the reference documentation page.

BTW may I suggest also to add

-cpu host

To prevent this message:

qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.80000001H:ECX.svm [bit 2]

It works without, but it can be misleading.

cc: @lool

1 Like
5

It seems the getting started and documentation is no longer correct as snap install nano throws an error.

root@nuc:~# cat /etc/os-release 
NAME="Ubuntu Core"
VERSION="20"
ID=ubuntu-core
PRETTY_NAME="Ubuntu Core 20"
VERSION_ID="20"
HOME_URL="https://snapcraft.io/"
BUG_REPORT_URL="https://bugs.launchpad.net/snappy/"

root@nuc:~# snap list
Name       Version        Rev    Tracking       Publisher   Notes
bluez      5.48-3         284    latest/stable  canonical✓  -
core       16-2.51.3      11420  latest/stable  canonical✓  core
core18     20210722       2128   latest/stable  canonical✓  base
core20     20210702       1081   latest/stable  canonical✓  base
nextcloud  21.0.3snap2    28417  latest/stable  nextcloud✓  -
pc         20-0.4         115    20/stable      canonical✓  gadget
pc-kernel  5.4.0-81.91.1  811    20/stable      canonical✓  kernel
snapd      2.51.3         12704  latest/stable  canonical✓  snapd

root@nuc:~# snap install nano
error: snap "nano" requires classic confinement which is only available on classic systems

root@nuc:~# sudo snap install nano-strict
nano-strict 5.2+pkg-353f from æž—ćšä»(Buo-ren, Lin) (brlin) installed
6

Thanks for highlighting this issue. This part of the tutorial has moved to Using Ubuntu Core, but we also updated the example to use nano-strict (as your suggested example shows). Thanks!

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This page is confusing as it starts off talking about installing on RPi, but switches into a QEMU example that clearly is targeting Intel x86 64.

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Should that last SSH command to log into the QEMU session not be connecting to “localhost”?

1 Like
9

The link entitled “Supported Platforms” actually takes you to “System Requirements”.

10

You might want to drop UC16 and UC18 from the list of supported releases.

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UC16 is supported until 2026, UC18 until 2028 (unlike for classic there is no 5y/10y separaton
of community vs commercial support here), so both are fully supported for a full 10y



what is not supported by snapcraft anymore is building snaps for their bases and that should be mentioned


1 Like
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Given that the QEMU page is coming up in the order of pages, I’m not sure it’s worth covering here in any detail at all; just point at the QEMU page.