ubuntu@ubuntu:~$ lsblk -po NAME,SIZE,TYPE,FSTYPE,PARTLABEL NAME SIZE TYPE FSTYPE PARTLABEL /dev/loop0 1.9G loop squashfs /dev/loop1 27.1M loop squashfs /dev/loop2 55M loop squashfs /dev/loop3 240.8M loop squashfs /dev/loop4 62.1M loop squashfs /dev/loop5 49.8M loop squashfs /dev/sda 465.8G disk ├─/dev/sda1 292M part vfat CLR_BOOT ├─/dev/sda2 512M part swap CLR_SWAP ├─/dev/sda3 108.6G part ext4 CLR_ROOT ├─/dev/sda4 16M part Microsoft reserved partition ├─/dev/sda5 79G part ntfs Basic data partition └─/dev/sda6 277.4G part ntfs Basic data partition /dev/sdb 30.2G disk iso9660 ├─/dev/sdb1 2.5G part iso9660 ├─/dev/sdb2 3.9M part vfat └─/dev/sdb3 27.7G part ext4 /dev/sr0 1024M rom ubuntu@ubuntu:~$ 1 Answer
# Everything in this tutorial should be done as root: sudo -i # Now hop on into the EFI partition root. cd /boot/efi # Configuration files will go here: mkdir -p loader/entries # And kernels will go here: mkdir ubuntu Put the following into /boot/efi/loader/loader.conf (change the timeout value to your pleasing)
default ubuntu timeout 1 editor 0 Put the following to /etc/kernel/postinst.d/zz-update-systemd-boot Make sure to change the CHANGEMEs.
#!/bin/bash # # This is a simple kernel hook to populate the systemd-boot entries # whenever kernels are added or removed. # # The UUID of your disk. UUID="CHANGEME" # The LUKS volume slug you want to use, which will result in the # partition being mounted to /dev/mapper/CHANGEME. VOLUME="CHANGEME" # Any rootflags you wish to set. ROOTFLAGS="CHANGEME" # Our kernels. KERNELS=() FIND="find /boot -maxdepth 1 -name 'vmlinuz-*' -type f -print0 | sort -rz" while IFS= read -r -u3 -d $'\0' LINE; do KERNEL=$(basename "${LINE}") KERNELS+=("${KERNEL:8}") done 3< <(eval "${FIND}") # There has to be at least one kernel. if [ ${#KERNELS[@]} -lt 1 ]; then echo -e "\e[2msystemd-boot\e[0m \e[1;31mNo kernels found.\e[0m" exit 1 fi # Perform a nuclear clean to ensure everything is always in perfect # sync. rm /boot/efi/loader/entries/*.conf rm -rf /boot/efi/ubuntu mkdir /boot/efi/ubuntu # Copy the latest kernel files to a consistent place so we can keep # using the same loader configuration. LATEST="${KERNELS[@]:0:1}" echo -e "\e[2msystemd-boot\e[0m \e[1;32m${LATEST}\e[0m" for FILE in config initrd.img System.map vmlinuz; do cp "/boot/${FILE}-${LATEST}" "/boot/efi/ubuntu/${FILE}" cat << EOF > /boot/efi/loader/entries/ubuntu.conf title Ubuntu GNOME linux /ubuntu/vmlinuz initrd /ubuntu/initrd.img options cryptdevice=UUID=${UUID}:${VOLUME} root=/dev/mapper/${VOLUME} ro rootflags=${ROOTFLAGS} EOF done # Copy any legacy kernels over too, but maintain their version-based # names to avoid collisions. if [ ${#KERNELS[@]} -gt 1 ]; then LEGACY=("${KERNELS[@]:1}") for VERSION in "${LEGACY[@]}"; do echo -e "\e[2msystemd-boot\e[0m \e[1;32m${VERSION}\e[0m" for FILE in config initrd.img System.map vmlinuz; do cp "/boot/${FILE}-${VERSION}" "/boot/efi/ubuntu/${FILE}-${VERSION}" cat << EOF > /boot/efi/loader/entries/ubuntu-${VERSION}.conf title Ubuntu GNOME ${VERSION} linux /ubuntu/vmlinuz-${VERSION} initrd /ubuntu/initrd.img-${VERSION} options cryptdevice=UUID=${UUID}:${VOLUME} root=/dev/mapper/${VOLUME} ro rootflags=${ROOTFLAGS} EOF done done fi # Success! exit 0 If your setup is simple, you might do without any ROOTFLAGS and VOLUME and the appropriate line in the script might be as follows: options root=UUID=${UUID} ro
Take care of permissions:
chown root: /etc/kernel/postinst.d/zz-update-systemd-boot chmod 0755 /etc/kernel/postinst.d/zz-update-systemd-bootcd /etc/kernel/postrm.d/ && ln -s ../postinst.d/zz-update-systemd-boot zz-update-systemd-boot [ -d "/etc/initramfs/post-update.d" ] || mkdir -p /etc/initramfs/post-update.d cd /etc/initramfs/post-update.d/ && ln -s ../../kernel/postinst.d/zz-update-systemd-boot zz-update-systemd-boot Your /boot/efi/loader/entries/ubuntu.conf should then look something like this (obviously, you need to cahnge the UUID):
title Ubuntu GNOME linux /ubuntu/vmlinuz initrd /ubuntu/initrd.img options root=UUID=81c4bc1c-1a7e-4822-acae-220bbe572240 ro to see UUID
ubuntu@ubuntu:~$ lsblk -f NAME FSTYPE LABEL UUID FSAVAIL FSUSE% MOUNTPOINT loop0 squashfs 0 100% /rofs loop1 squashfs 0 100% /snap/snapd/7264 loop2 squashfs 0 100% /snap/core18/1705 loop3 squashfs 0 100% /snap/gnome-3-34-1804/24 loop4 squashfs 0 100% /snap/gtk-common-themes/1 loop5 squashfs 0 100% /snap/snap-store/433 sda ├─sda1 vfat 1A74-A270 113.2M 61% /media/ubuntu/1A74-A270 ├─sda2 swap 10842320-1286-413f-bf08-3e0ca76bcf2f [SWAP] ├─sda3 ext4 81c4bc1c-1a7e-4822-acae-220bbe572240 87.6G 13% /media/ubuntu/81c4bc1c-1a ├─sda4 ├─sda5 ntfs 80D47B63D47B59FC └─sda6 ntfs router_data 4416017316016770 sdb iso9660 Ubuntu 20.04 LTS amd64 2020-04-23-07-51-42-00 ├─sdb1 iso9660 Ubuntu 20.04 LTS amd64 2020-04-23-07-51-42-00 0 100% /cdrom ├─sdb2 vfat 1AC3-20ED └─sdb3 ext4 writable b8474e17-164a-4fb3-94ff-d4e68f2e1548 25.7G 0% /var/crash sr0
Look up your current kernel and reinstall it to trigger the hooks you just created: sudo apt install --reinstall linux-image-5.13.0-22-generic.
Actually Install systemd-boot For most people, installation consists of a single command:
Again, this should go to the EFI partition:
bootctl install --path=/boot/efi To verify the bootloaders installed on the system — and their order — run:
efibootmgr reboot once everything ok you can remove the existence of grub in your system
# Purge the packages. apt-get purge grub* # Purge any obsolete dependencies. apt-get autoremove --purge 
