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Update instructions for Ubuntu on Raspberry Pi for 20.04.2 release.

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Update the getting started instructions for Ubuntu on a Raspberry Pi to
use the 20.04.2 LTS release. Add `-a` flag to the `wipefs` command to
make sure it will erase any filesystem header from previous use of the
SD card.

Signed-off-by: Fernando Carolo <fcarolo@google.com>
This commit is contained in:
Fernando Carolo
2021-05-01 17:54:31 +01:00
committed by Richard Laager
parent d022e79773
commit fd48b2641f
1 changed files with 14 additions and 14 deletions
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28
docs/Getting Started/Ubuntu/Ubuntu 20.04 Root on ZFS for Raspberry Pi.rst
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@@ -20,8 +20,8 @@ System Requirements
- A Raspberry Pi 4 B. (If you are looking to install on a regular PC, see
:doc:`Ubuntu 20.04 Root on ZFS`.)
- `Ubuntu Server 20.04.1 (“Focal”) for Raspberry Pi 4
<https://cdimage.ubuntu.com/releases/20.04.1/release/ubuntu-20.04.1-preinstalled-server-arm64+raspi.img.xz>`__
- `Ubuntu Server 20.04.2 (“Focal”) for Raspberry Pi 4
<https://cdimage.ubuntu.com/releases/20.04.2/release/ubuntu-20.04.2-preinstalled-server-arm64+raspi.img.xz>`__
- A microSD card. For recommendations, see Jeff Geerling's `performance
comparison
<https://www.jeffgeerling.com/blog/2019/raspberry-pi-microsd-card-performance-comparison-2019>`__.
@@ -107,30 +107,30 @@ be deleted.
#. Download and unpack the official image::
curl -O https://cdimage.ubuntu.com/releases/20.04.1/release/ubuntu-20.04.1-preinstalled-server-arm64+raspi.img.xz
xz -d ubuntu-20.04.1-preinstalled-server-arm64+raspi.img.xz
curl -O https://cdimage.ubuntu.com/releases/20.04.2/release/ubuntu-20.04.2-preinstalled-server-arm64+raspi.img.xz
xz -d ubuntu-20.04.2-preinstalled-server-arm64+raspi.img.xz
# or combine them to decompress as you download:
curl https://cdimage.ubuntu.com/releases/20.04.1/release/ubuntu-20.04.1-preinstalled-server-arm64+raspi.img.xz | \
xz -d > ubuntu-20.04.1-preinstalled-server-arm64+raspi.img
curl https://cdimage.ubuntu.com/releases/20.04.2/release/ubuntu-20.04.2-preinstalled-server-arm64+raspi.img.xz | \
xz -d > ubuntu-20.04.2-preinstalled-server-arm64+raspi.img
#. Dump the partition table for the image::
sfdisk -d ubuntu-20.04.1-preinstalled-server-arm64+raspi.img
sfdisk -d ubuntu-20.04.2-preinstalled-server-arm64+raspi.img
That will output this::
label: dos
label-id: 0xab86aefd
device: ubuntu-20.04.1-preinstalled-server-arm64+raspi.img
label-id: 0x4ec8ea53
device: ubuntu-20.04.2-preinstalled-server-arm64+raspi.img
unit: sectors
<name>.img1 : start= 2048, size= 524288, type=c, bootable
<name>.img2 : start= 526336, size= 5822896, type=83
<name>.img2 : start= 526336, size= 5839840, type=83
The important numbers are 524288 and 5822896. Store those in variables::
The important numbers are 524288 and 5839840. Store those in variables::
export BOOT=524288
export ROOT=5822896
export ROOT=5839840
#. Create a partition script::
@@ -186,7 +186,7 @@ be deleted.
#. Loopback mount the image::
IMG=$(sudo losetup -fP --show \
ubuntu-20.04.1-preinstalled-server-arm64+raspi.img)
ubuntu-20.04.2-preinstalled-server-arm64+raspi.img)
#. Copy the bootloader data::
@@ -194,7 +194,7 @@ be deleted.
#. Clear old label(s) from partition 2::
sudo wipefs ${DISK}p2
sudo wipefs -a ${DISK}p2
If a filesystem with the ``writable`` label from the Ubuntu image is still
present in partition 2, the system will not boot initially.