Ubuntu 26.04 LTS on Banana Pi-Class ARM Boards: What to Expect, What Breaks, and How to Recover

Ubuntu 26.04 and ARM SBCs

Ubuntu 26.04 LTS (Plucky Puffin) brings GNOME 48, kernel 6.14+, and systemd 257 to the armhf and arm64 architectures. On high-end ARM hardware (Raspberry Pi 5, Apple Silicon VMs), this works well. On older Allwinner A20-class boards like the Banana Pi, the picture is more complicated.

Ubuntu's ARM images prioritise newer hardware. The further your board is from Canonical's test matrix, the more breakage you should expect. This guide documents the specific issues and workarounds for running Ubuntu 26.04 LTS on Banana Pi-class Allwinner A20 boards.

What Works Out of the Box

• Ethernet — the stmmac driver supports the RTL8211E PHY without issues
• SATA — the ahci-sunxi driver loads automatically
• USB — both host ports work; OTG requires manual gadget configuration
• Serial console — 115200 baud on the debug header works for u-boot and kernel output
• Basic apt operations — the armhf package repository is complete

What Breaks and Why

Desktop environment (if installed)

GNOME 48 on a dual-core Cortex-A7 with 1 GB RAM is not usable. The system will boot to a login screen but become unresponsive under any real workload. Use the server image or install a lightweight DE like LXDE.

Snap-based packages

Ubuntu 26.04 defaults to snap for several core packages. On a 1 GB ARM board, snapd consumes 150-200 MB of RAM at idle and causes significant I/O load on microSD storage. Disable it unless you specifically need it.

# Remove snapd to free resources
sudo apt purge snapd
sudo rm -rf /snap /var/snap /var/lib/snapd /var/cache/snapd

# Prevent snapd from being reinstalled
cat <<'EOF' | sudo tee /etc/apt/preferences.d/no-snap.pref
Package: snapd
Pin: release a=*
Pin-Priority: -10
EOF

Cloud-init on server images

The server image runs cloud-init on first boot, which can take 3-5 minutes on slow storage and may timeout if there is no metadata service available.

# Disable cloud-init if not needed
sudo touch /etc/cloud/cloud-init.disabled
sudo systemctl disable cloud-init cloud-init-local cloud-config cloud-final

Kernel module changes

Ubuntu's generic arm kernel may not include all sunxi-specific modules as built-in. Check whether your critical drivers are loaded:

lsmod | grep -E "sun|ahci|stmmac|brcm"

Installation on Banana Pi-Class Boards

# Download the Ubuntu 26.04 LTS server image for armhf
# (Check the official Ubuntu ARM page for the current download URL)
wget https://cdimage.ubuntu.com/releases/26.04/release/ubuntu-26.04-preinstalled-server-armhf+bananapi.img.xz

# Verify the checksum
sha256sum -c SHA256SUMS 2>/dev/null | grep bananapi

# Flash to microSD
xzcat ubuntu-26.04-*.img.xz | sudo dd of=/dev/sdX bs=1M status=progress conv=fsync
sync

Post-Install Fixes

# 1. Update immediately
sudo apt update && sudo apt upgrade -y

# 2. Set timezone and NTP
sudo timedatectl set-timezone Europe/London
sudo timedatectl set-ntp true

# 3. Expand the root filesystem if it wasn't auto-expanded
sudo growpart /dev/mmcblk0 1
sudo resize2fs /dev/mmcblk0p1

# 4. Check for failed services
systemctl --failed

# 5. Install essential tools
sudo apt install htop iotop tmux curl wget

Kernel and Driver Issues

Ubuntu's kernel packaging differs from Debian's. The key differences for SBC users:

• HWE kernels — Ubuntu may push a newer hardware enablement kernel that breaks sunxi drivers. Pin the GA kernel if the HWE kernel causes regressions.
• Missing device tree — if cat /proc/device-tree/model shows nothing or the wrong board, the kernel may not include the correct DTB.
• Module signing — Ubuntu enables module signing by default, which can prevent loading out-of-tree modules.

# Pin the GA kernel to avoid HWE regression
sudo apt-mark hold linux-image-generic-hwe-26.04

# Check the current device tree
cat /proc/device-tree/model

# List available DTBs
ls /boot/dtbs/*/sun7i-a20-bananapi.dtb 2>/dev/null || \
ls /lib/firmware/*/device-tree/allwinner/sun7i-a20-bananapi.dtb 2>/dev/null

Recovery Procedures

Kernel panic on boot

1. Connect serial console (115200 baud, 3.3V TTL)
2. Interrupt u-boot by pressing any key during countdown
3. Boot from a known-good kernel:

# At the u-boot prompt, list available kernels
ls mmc 0:1 /boot/

# Boot a specific kernel manually
setenv bootargs "root=/dev/mmcblk0p1 console=ttyS0,115200"
load mmc 0:1 0x46000000 /boot/vmlinuz-6.8.0-xx-generic
load mmc 0:1 0x49000000 /boot/initrd.img-6.8.0-xx-generic
load mmc 0:1 0x4a000000 /boot/dtbs/6.8.0-xx-generic/sun7i-a20-bananapi.dtb
bootz 0x46000000 0x49000000 0x4a000000

System unresponsive (OOM)

# If the system becomes unresponsive due to memory pressure,
# connect via serial console and check:
cat /proc/meminfo | head -5
dmesg | grep -i "out of memory\|oom"

# Add swap if not present:
sudo fallocate -l 1G /swapfile
sudo chmod 600 /swapfile
sudo mkswap /swapfile
sudo swapon /swapfile
echo '/swapfile swap swap defaults 0 0' | sudo tee -a /etc/fstab

apt broken after partial upgrade

# Fix broken packages
sudo dpkg --configure -a
sudo apt --fix-broken install

# If dpkg database is corrupt, boot from another SD card and repair:
sudo fsck /dev/mmcblk0p1
sudo mount /dev/mmcblk0p1 /mnt
sudo chroot /mnt dpkg --configure -a

Should You Use Ubuntu on These Boards?

For headless server use on Banana Pi-class hardware, Debian 13 or Armbian typically provide a better experience. Ubuntu's advantages (snap ecosystem, Canonical support, HWE kernels) are less relevant on older ARM SBCs. Consider Ubuntu on these boards only if:

• You need a specific Ubuntu-only package or PPA
• Your organisation standardises on Ubuntu and needs consistency across all platforms
• You are testing ARM compatibility of Ubuntu-targeted software

For most use cases, Debian 13 on Banana Pi is the more reliable choice.

Related Reading

• Debian 13 on Banana Pi install guide — the recommended Debian path for this hardware
• Debian 13 on Banana Pro with Wi-Fi — Wi-Fi/Bluetooth setup for the Banana Pro variant
• Banana Pi hardware specifications
• LeMaker downloads hub