#!/bin/bash # Script that fixes an Ubuntu 20.04 / 20.10 partition created by the official Raspberry Pi Imager to boot with a Raspberry Pi 4 # by James A. Chambers - https://jamesachambers.com/raspberry-pi-4-ubuntu-20-04-usb-mass-storage-boot-guide
# First image your drive with Ubuntu 20.04 or 20.10 using the official Pi Imager tool # Next connect your drive to the Raspberry Pi # Find drive using lsblk (normally it's /dev/sda but check first) -- unmount if it was automatically mounted with sudo umount mountpoint (ex: sudo umount /media/pi/system-boot) # Mount boot partition with sudo mount /dev/sda1 /mnt/boot # Mount writable partition with sudo mount /dev/sda2 /mnt/writable # Now you are ready to run this script to update the partition for Raspberry Pi booting
# Safety check, check for /boot directory and /usr/bin/raspinfo - NO LONGER USED - See Issue #140 # if ! command -v git >/dev/null ; then # echo "Safety check: git was not found. Please install using sudo apt install git. Exiting..." # exit 1 # fi
# Safety check, run as sudo if [ $(id -u) != 0 ]; then echo "Safety check: This script is meant to be ran as root or sudo. Please run using sudo ./BootFix.sh. Exiting..." exit 1 fi
# Safety check -- check for system-boot automount if [ -d /media/*/system-boot ]; then echo "Safety check: automount detected at /media/*/system-boot. Please unmount the automount in File Explorer or with sudo umount /media/$LOGNAME/system-boot." exit 1 fi
# Safety check -- check for writable automount if [ -d /media/*/writable ]; then echo "Safety check: automount detected at /media/*/writable. Please unmount the automount in File Explorer or with sudo umount /media/$LOGNAME/system-boot." exit 1 fi
# Find the "writable" root filesystem mount if [ -d /mnt/writable ] && [ -d /mnt/writable/usr/lib/u-boot ] ; then mntWritable='/mnt/writable' else echo "The partition 'writable' was not found in /mnt/writable. Make sure you have mounted your USB mass storage device (ex: sudo mount /dev/sda2 /mnt/writable)." exit 1 fi echo "Found writable partition at $mntWritable"
# Find the "system-boot" boot filesystem mount if [ -d /mnt/boot ] && [ -e /mnt/boot/vmlinuz ]; then mntBoot='/mnt/boot' else echo "The 'boot' partition was not found in /mnt/boot. Make sure you have mounted your USB mass storage device (ex: sudo mount /dev/sda1 /mnt/boot)." exit 1 fi echo "Found boot partition at $mntBoot"
# Commented out -- not necessary after 20.04.2 and causes issues # Clone firmware repository #if [ ! -d rpi-firmware ]; then # git clone https://github.com/Hexxeh/rpi-firmware.git --depth 1 #else # cd rpi-firmware # git pull # cd .. #fi
# Update firmware #echo "Updating firmware..." #if [ -d rpi-firmware ]; then # sudo cp rpi-firmware/*.dat "$mntBoot" # sudo cp rpi-firmware/*.elf "$mntBoot" # sudo cp rpi-firmware/*.bin "$mntBoot" # # Update DTBs if not Ubuntu Server 20.04 # if cat "$mntWritable/etc/os-release" | grep -q "Ubuntu 20.04.1"; then # if [ ! -d "$mntWritable/lib/X11" ]; then # if cat "$mntBoot/config.txt" | grep -q "arm_64bit=1"; then # # Ubuntu server 20.04.1 64 bit- skip copying DTBs # echo "Skipping copying DTBs for Ubuntu Server 20.04.1 64 bit" # else # sudo cp rpi-firmware/*.dtb "$mntBoot" # fi # else # sudo cp rpi-firmware/*.dtb "$mntBoot" # fi # else # sudo cp rpi-firmware/*.dtb "$mntBoot" # fi # rm -rf rpi-firmware #else # echo "Failed to clone rpi-firmware repository with git. Are you connected to the internet? Exiting..." # rm -rf rpi-firmware # exit 1 #fi
# Decompress the kernel echo "Decompressing kernel from vmlinuz to vmlinux..." zcat -qf "$mntBoot/vmlinuz" > "$mntBoot/vmlinux" echo "Kernel decompressed"
# Check if 32 bit or 64 bit and modify config.txt if cat "$mntBoot/config.txt" | grep -q "arm_64bit=1"; then
# Update config.txt with correct parameters echo "Updating config.txt with correct parameters..."
cat <<EOF | sudo tee "$mntBoot/config.txt">/dev/null # Please DO NOT modify this file; if you need to modify the boot config, the # usercfg.txt file is the place to include user changes. Please refer to # the README file for a description of the various configuration files on # the boot partition.
# The unusual ordering below is deliberate; older firmwares (in particular the # version initially shipped with bionic) don't understand the conditional # [sections] below and simply ignore them. The Pi4 doesn't boot at all with # firmwares this old so it's safe to place at the top. Of the Pi2 and Pi3, the # Pi3 uboot happens to work happily on the Pi2, so it needs to go at the bottom # to support old firmwares.
# The following settings are defaults expected to be overridden by the # included configuration. The only reason they are included is, again, to # support old firmwares which don't understand the include command.
enable_uart=1 cmdline=cmdline.txt
include syscfg.txt include usercfg.txt
EOF
# End 64 bit else
# Update config.txt with correct parameters echo "Updating config.txt with correct parameters..."
cat <<EOF | sudo tee "$mntBoot/config.txt">/dev/null # Please DO NOT modify this file; if you need to modify the boot config, the # usercfg.txt file is the place to include user changes. Please refer to # the README file for a description of the various configuration files on # the boot partition.
# The unusual ordering below is deliberate; older firmwares (in particular the # version initially shipped with bionic) don't understand the conditional # [sections] below and simply ignore them. The Pi4 doesn't boot at all with # firmwares this old so it's safe to place at the top. Of the Pi2 and Pi3, the # Pi3 uboot happens to work happily on the Pi2, so it needs to go at the bottom # to support old firmwares.
# The following settings are defaults expected to be overridden by the # included configuration. The only reason they are included is, again, to # support old firmwares which don't understand the include command.
enable_uart=1 cmdline=cmdline.txt
include syscfg.txt include usercfg.txt
EOF
# End 32 bit fi
# Create script to automatically decompress kernel (source: https://www.raspberrypi.org/forums/viewtopic.php?t=278791) echo "Creating script to automatically decompress kernel..." cat << \EOF | sudo tee "$mntBoot/auto_decompress_kernel">/dev/null #!/bin/bash -e # auto_decompress_kernel script BTPATH=/boot/firmware CKPATH=$BTPATH/vmlinuz DKPATH=$BTPATH/vmlinux # Check if compression needs to be done. if [ -e $BTPATH/check.md5 ]; then if md5sum --status --ignore-missing -c $BTPATH/check.md5; then echo -e "\e[32mFiles have not changed, Decompression not needed\e[0m" exit 0 else echo -e "\e[31mHash failed, kernel will be compressed\e[0m" fi fi # Backup the old decompressed kernel mv $DKPATH $DKPATH.bak if [ ! $? == 0 ]; then echo -e "\e[31mDECOMPRESSED KERNEL BACKUP FAILED!\e[0m" exit 1 else echo -e "\e[32mDecompressed kernel backup was successful\e[0m" fi # Decompress the new kernel echo "Decompressing kernel: "$CKPATH".............." zcat -qf $CKPATH > $DKPATH if [ ! $? == 0 ]; then echo -e "\e[31mKERNEL FAILED TO DECOMPRESS!\e[0m" exit 1 else echo -e "\e[32mKernel Decompressed Succesfully\e[0m" fi # Hash the new kernel for checking md5sum $CKPATH $DKPATH > $BTPATH/check.md5 if [ ! $? == 0 ]; then echo -e "\e[31mMD5 GENERATION FAILED!\e[0m" else echo -e "\e[32mMD5 generated Succesfully\e[0m" fi exit 0 EOF sudo chmod +x "$mntBoot/auto_decompress_kernel"
# Create apt script to automatically decompress the kernel echo "Creating apt script to automatically decompress kernel..." echo 'DPkg::Post-Invoke {"/bin/bash /boot/firmware/auto_decompress_kernel"; };' | sudo tee "$mntWritable/etc/apt/apt.conf.d/999_decompress_rpi_kernel" >/dev/null sudo chmod +x "$mntWritable/etc/apt/apt.conf.d/999_decompress_rpi_kernel"
# Successful echo "Updating Ubuntu partition was successful! Shut down your Pi, remove the SD card then reconnect the power."
然后新建一个脚本文件：
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nano BootFix.sh
粘贴后ctrl+o保存，ctrl+x退出 然后执行：
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chmod +x BootFix.sh sudo ./BootFix.sh
只要您正确挂载了分区，它就会修改分区并告诉您它已成功：
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pi@triority:~ $ sudo ./BootFix.sh Found writable partition at /mnt/writable Found boot partition at /mnt/boot Decompressing kernel from vmlinuz to vmlinux... Kernel decompressed Updating config.txt with correct parameters... Creating script to automatically decompress kernel... Creating apt script to automatically decompress kernel... Updating Ubuntu partition was successful! Shut down your Pi, remove the SD card then reconnect the power.
Please contact me if you have any questions. We are using the CDN service by Cloudflare, without nodes in Chinese mainland. As for the people in Chinese mainland should solve the problem, like the terrible loading speed, by themselves.
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