The solution seems to be re-issue the apt dist-upgrade command again. And this time the upgrade process will ended successfully with a Warning:
$ sudo apt-get dist-upgrade Reading package lists... Done Building dependency tree Reading state information... Done Calculating upgrade... Done The following packages were automatically installed and are no longer required: linux-headers-4.15.0-15 linux-headers-4.15.0-15-generic linux-image-4.15.0-15-generic linux-image-extra-4.15.0-15-generic Use 'sudo apt autoremove' to remove them. 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. 1 not fully installed or removed. After this operation, 0 B of additional disk space will be used. Do you want to continue? [Y/n] Setting up initramfs-tools (0.130ubuntu3) ... update-initramfs: deferring update (trigger activated) Processing triggers for initramfs-tools (0.130ubuntu3) ... update-initramfs: Generating /boot/initrd.img-4.15.0-19-generic Using config file '/etc/zipl.conf' Building bootmap in '/boot' Building menu 'menu' Adding #1: IPL section 'ubuntu' (default) Adding #2: IPL section 'old' Preparing boot device: vda (0000). Done. W: APT had planned for dpkg to do more than it reported back (0 vs 4). Affected packages: initramfs-tools:s390x $ echo $? 0 -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1766176 Title: initramfs-tools returns error while installing the proposed Bionic kernel Status in linux package in Ubuntu: Confirmed Bug description: This issue was spotted on a ThunderX ARM64 system and s390x, AMD64 system does not have this issue Steps: 1. Deploy a ThunderX ARM64 node 2. Enable -proposed, commence apt update and dist-upgrade Result: Setting up linux-generic (4.15.0.19.20) ... Processing triggers for initramfs-tools (0.130ubuntu3) ... update-initramfs: Generating /boot/initrd.img-4.15.0-15-generic W: Possible missing firmware /lib/firmware/ast_dp501_fw.bin for module ast Ignoring old or unknown version 4.15.0-15-generic (latest is 4.15.0-19-generic) Use --force if you want version 4.15.0-15-generic. run-parts: /etc/initramfs/post-update.d//flash-kernel exited with return code 2 dpkg: error processing package initramfs-tools (--configure): installed initramfs-tools package post-installation script subprocess returned error exit status 1 Processing triggers for linux-image-4.15.0-19-generic (4.15.0-19.20) ... /etc/kernel/postinst.d/initramfs-tools: update-initramfs: Generating /boot/initrd.img-4.15.0-19-generic W: Possible missing firmware /lib/firmware/ast_dp501_fw.bin for module ast flash-kernel: deferring update (trigger activated) /etc/kernel/postinst.d/zz-flash-kernel: flash-kernel: deferring update (trigger activated) /etc/kernel/postinst.d/zz-update-grub: Generating grub configuration file ... Warning: Setting GRUB_TIMEOUT to a non-zero value when GRUB_HIDDEN_TIMEOUT is set is no longer supported. Found linux image: /boot/vmlinuz-4.15.0-19-generic Found initrd image: /boot/initrd.img-4.15.0-19-generic Found linux image: /boot/vmlinuz-4.15.0-15-generic Found initrd image: /boot/initrd.img-4.15.0-15-generic Adding boot menu entry for EFI firmware configuration done Processing triggers for systemd (237-3ubuntu10) ... Processing triggers for ureadahead (0.100.0-20) ... Errors were encountered while processing: initramfs-tools E: Sub-process /usr/bin/dpkg returned an error code (1) ubuntu@starmie-kernel:~$ For error on s390x: Setting up linux-modules-extra-4.15.0-19-generic (4.15.0-19.20) ... Setting up linux-image-generic (4.15.0.19.20) ... Setting up linux-headers-generic (4.15.0.19.20) ... Setting up linux-generic (4.15.0.19.20) ... Processing triggers for initramfs-tools (0.130ubuntu3) ... update-initramfs: Generating /boot/initrd.img-4.15.0-17-generic Using config file '/etc/zipl.conf' Error: Ramdisk file '/boot/initrd.img' in section 'ubuntu': No such file or directory run-parts: /etc/initramfs/post-update.d//zz-zipl exited with return code 1 dpkg: error processing package initramfs-tools (--configure): installed initramfs-tools package post-installation script subprocess returned error exit status 1 Processing triggers for libc-bin (2.27-3ubuntu1) ... Processing triggers for linux-image-4.15.0-19-generic (4.15.0-19.20) ... /etc/kernel/postinst.d/initramfs-tools: update-initramfs: Generating /boot/initrd.img-4.15.0-19-generic Using config file '/etc/zipl.conf' Building bootmap in '/boot' Building menu 'menu' Adding #1: IPL section 'ubuntu' (default) Adding #2: IPL section 'old' Preparing boot device: dasda (0200). Done. /etc/kernel/postinst.d/zz-zipl: Using config file '/etc/zipl.conf' Building bootmap in '/boot' Building menu 'menu' Adding #1: IPL section 'ubuntu' (default) Adding #2: IPL section 'old' Preparing boot device: dasda (0200). Done. ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: linux-image-4.15.0-15-generic 4.15.0-15.16 ProcVersionSignature: User Name 4.15.0-15.16-generic 4.15.15 Uname: Linux 4.15.0-15-generic aarch64 AlsaDevices: total 0 crw-rw---- 1 root audio 116, 1 Apr 23 04:36 seq crw-rw---- 1 root audio 116, 33 Apr 23 04:36 timer AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay' ApportVersion: 2.20.9-0ubuntu6 Architecture: arm64 ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 'arecord' AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: Date: Mon Apr 23 06:00:17 2018 IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig' MachineType: Cavium ThunderX CRB PciMultimedia: ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=C.UTF-8 SHELL=/bin/bash ProcFB: 0 EFI VGA 1 astdrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-15-generic root=UUID=d4e5f461-24ef-47d8-a67f-42c82ff1efe8 ro acpi=force iommu.passthrough=1 RelatedPackageVersions: linux-restricted-modules-4.15.0-15-generic N/A linux-backports-modules-4.15.0-15-generic N/A linux-firmware 1.173 RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill' SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 12/12/2012 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 5.11 dmi.board.asset.tag: To be filled by O.E.M. dmi.board.name: To be filled by O.E.M. dmi.board.vendor: To be filled by O.E.M. dmi.board.version: To be filled by O.E.M. dmi.chassis.asset.tag: To be filled by O.E.M. dmi.chassis.type: 0 dmi.chassis.vendor: Cavium dmi.chassis.version: To be filled by O.E.M. dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr5.11:bd12/12/2012:svnCavium:pnThunderXCRB:pvrTobefilledbyO.E.M.:rvnTobefilledbyO.E.M.:rnTobefilledbyO.E.M.:rvrTobefilledbyO.E.M.:cvnCavium:ct0:cvrTobefilledbyO.E.M.: dmi.product.family: Default string dmi.product.name: ThunderX CRB dmi.product.version: To be filled by O.E.M. dmi.sys.vendor: Cavium To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1766176/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp