Hi there! This could be a duplicate of #650724, but given that the error shown is different, I reported it as a new bug. I changed both 500GB Samsung HDs with two 1TB Seagate HDs (in RAID1, LV for /), in series: changed the first, rebuilt the RAID1, checked that everything was OK, reconfigured grub-pc for the new disk and then started again for the second, but it seems I missed the second 'dpkg-reconfigure grub-pc' step and the last kernel upgrade fails: ===== tinello:/etc# apt-get update [...] tinello:/etc# apt-get upgrade [...] The following packages will be upgraded: linux-image-2.6.32-5-amd64 [...] Preconfiguring packages ... (Reading database ... 133332 files and directories currently installed.) Preparing to replace linux-image-2.6.32-5-amd64 2.6.32-38 \ (using .../linux-image-2.6.32-5-amd64_2.6.32-39_amd64.deb) ... Unpacking replacement linux-image-2.6.32-5-amd64 ... Examining /etc/kernel/postrm.d . run-parts: executing /etc/kernel/postrm.d/initramfs-tools 2.6.32-5-amd64 \ /boot/vmlinuz-2.6.32-5-amd64 run-parts: executing /etc/kernel/postrm.d/zz-update-grub 2.6.32-5-amd64 \ /boot/vmlinuz-2.6.32-5-amd64 Setting up linux-image-2.6.32-5-amd64 (2.6.32-39) ... Running depmod. Running update-initramfs. update-initramfs: deferring update (hook will be called later) Examining /etc/kernel/postinst.d. run-parts: executing /etc/kernel/postinst.d/initramfs-tools 2.6.32-5-amd64 \ /boot/vmlinuz-2.6.32-5-amd64 update-initramfs: Generating /boot/initrd.img-2.6.32-5-amd64 run-parts: executing /etc/kernel/postinst.d/pm-utils 2.6.32-5-amd64 \ /boot/vmlinuz-2.6.32-5-amd64 run-parts: executing /etc/kernel/postinst.d/update-notifier 2.6.32-5-amd64 \ /boot/vmlinuz-2.6.32-5-amd64 run-parts: executing /etc/kernel/postinst.d/zz-update-grub 2.6.32-5-amd64 \ /boot/vmlinuz-2.6.32-5-amd64 Generating grub.cfg ... /usr/sbin/grub-probe: error: no such disk. run-parts: /etc/kernel/postinst.d/zz-update-grub exited with return code 1 Failed to process /etc/kernel/postinst.d at \ /var/lib/dpkg/info/linux-image-2.6.32-5-amd64.postinst line 799. dpkg: error processing linux-image-2.6.32-5-amd64 (--configure): subprocess installed post-installation script returned error exit status 2 configured to not write apport reports Errors were encountered while processing: linux-image-2.6.32-5-amd64 E: Sub-process /usr/bin/dpkg returned an error code (1) tinello:/etc# uname -a Linux tinello 3.0.0-1-amd64 #1 SMP Sat Aug 27 16:21:11 UTC 2011 x86_64 GNU/Linux tinello:/etc# dpkg-reconfigure grub-pc [...] ┌─────────────────────┤ Configuring grub-pc ├─────────────────────┐ │ The GRUB boot loader was previously installed to a disk that is │ │ no longer present, or whose unique identifier has changed for │ │ some reason. [...] │ [...] │ GRUB install devices: │ │ │ │ [*] /dev/sda (1000204 MB; ST31000524AS) │ │ [*] /dev/sdb (1000204 MB; ST31000524AS) │ │ [ ] /dev/dm-0 (491903 MB; tinello-root) │ │ [ ] /dev/md0 (199 MB; tinello:0) │ [...] /usr/sbin/grub-probe: error: no such disk. Auto-detection of a filesystem of /dev/md0 failed. Please report this together with the output of "/usr/sbin/grub-probe \ --device-map=/boot/grub/device.map --target=fs -v /boot/grub" to <bug-grub@gnu.org> /usr/sbin/grub-probe: error: no such disk. Auto-detection of a filesystem of /dev/md0 failed. Please report this together with the output of "/usr/sbin/grub-probe \ --device-map=/boot/grub/device.map --target=fs -v /boot/grub" to <bug-grub@gnu.org> Package configuration ┌─────────────────────┤ Configuring grub-pc ├─────────────────────┐ │ │ │ GRUB failed to install to the following devices: │ │ │ │ /dev/sda /dev/sdb │ [...] Generating grub.cfg ... /usr/sbin/grub-probe: error: no such disk. tinello:/etc# debconf-show grub-pc grub2/kfreebsd_cmdline: grub2/device_map_regenerated: * grub2/linux_cmdline: grub-pc/install_devices_empty: false grub-pc/install_devices_failed: false grub-pc/chainload_from_menu.lst: true grub-pc/kopt_extracted: false * grub-pc/install_devices: \ /dev/disk/by-id/ata-ST31000524AS_6VPC7CTQ, \ /dev/disk/by-id/ata-SAMSUNG_HD502HJ_S20BJ9FB109405 grub-pc/postrm_purge_boot_grub: false grub-pc/install_devices_failed_upgrade: true grub-pc/disk_description: grub2/kfreebsd_cmdline_default: quiet grub-pc/partition_description: * grub-pc/install_devices_disks_changed: \ /dev/disk/by-id/ata-ST31000524AS_6VPC7CTQ, \ /dev/disk/by-id/ata-SAMSUNG_HD502HJ_S20BJ9FB109405 * grub2/linux_cmdline_default: quiet grub-pc/mixed_legacy_and_grub2: true tinello:/etc# /usr/sbin/grub-probe --device-map=/boot/grub/device.map \ --target=fs -v /boot/grub /usr/sbin/grub-probe: info: Cannot stat `/dev/disk/by-id/ata-SAMSUNG_HD502HJ_S20BJ9FB109400', skipping. /usr/sbin/grub-probe: info: Cannot stat `/dev/disk/by-id/ata-SAMSUNG_HD502HJ_S20BJ9FB109405', skipping. /usr/sbin/grub-probe: info: changing current directory to /dev. /usr/sbin/grub-probe: info: changing current directory to usb. /usr/sbin/grub-probe: info: changing current directory to dri. /usr/sbin/grub-probe: info: changing current directory to snd. /usr/sbin/grub-probe: info: changing current directory to by-path. /usr/sbin/grub-probe: info: changing current directory to cpu. /usr/sbin/grub-probe: info: changing current directory to shm. /usr/sbin/grub-probe: info: changing current directory to tinello. /usr/sbin/grub-probe: info: opening md/0. /usr/sbin/grub-probe: error: no such disk. tinello:/etc# ===== I think we have two problems here: 1) device.map is not in sync with the current situation, which means that a simple `grub-mkdevicemap` should solve this. 2) however, debconf's 'grub-pc/install_devices' is not in sync either and `dpkg-reconfigure grub-pc` does not solve it, while IMHO it should. I think there is a fundamental problem here: grub-pc's debconf mixes device names (/dev/sda) with device IDs (/dev/disk/by-id/...). This means that while you think you chose device names (so changing disks should not cause any problem), what is actually used is device IDs, which are not updated *before* starting grub-probe (so your choice is not taken into account). Indeed, updating this line was enough to solve the problem: ===== tinello:/etc# echo "grub-pc grub-pc/install_devices string \ /dev/disk/by-id/ata-ST31000524AS_6VPC7CTQ, \ /dev/disk/by-id/ata-ST31000524AS_9VPCW9CS" | debconf-set-selections tinello:/etc# dpkg-reconfigure grub-pc [...] ┌─────────────────────┤ Configuring grub-pc ├─────────────────────┐ │ The GRUB boot loader was previously installed to a disk that is │ │ no longer present, or whose unique identifier has changed for │ │ some reason. [...] │ [...] │ GRUB install devices: │ │ │ │ [*] /dev/sda (1000204 MB; ST31000524AS) │ │ [*] /dev/sdb (1000204 MB; ST31000524AS) │ │ [ ] /dev/dm-0 (491903 MB; tinello-root) │ │ [ ] /dev/md0 (199 MB; tinello:0) │ [...] Installation finished. No error reported. Installation finished. No error reported. Generating grub.cfg ... Found background image: /usr/share/images/desktop-base/desktop-grub.png Found linux image: /boot/vmlinuz-3.0.0-1-amd64 Found initrd image: /boot/initrd.img-3.0.0-1-amd64 Found linux image: /boot/vmlinuz-2.6.39-2-amd64 Found initrd image: /boot/initrd.img-2.6.39-2-amd64 Found linux image: /boot/vmlinuz-2.6.32-5-amd64 Found initrd image: /boot/initrd.img-2.6.32-5-amd64 done root@tinello:/etc# debconf-show grub-pc grub2/kfreebsd_cmdline: grub2/device_map_regenerated: * grub2/linux_cmdline: grub-pc/install_devices_empty: false grub-pc/install_devices_failed: false grub-pc/chainload_from_menu.lst: true grub-pc/kopt_extracted: false * grub-pc/install_devices: \ /dev/disk/by-id/ata-ST31000524AS_6VPC7CTQ, \ /dev/disk/by-id/ata-ST31000524AS_9VPCW9CS grub-pc/postrm_purge_boot_grub: false grub-pc/install_devices_failed_upgrade: true grub-pc/disk_description: grub2/kfreebsd_cmdline_default: quiet grub-pc/partition_description: * grub-pc/install_devices_disks_changed: \ /dev/disk/by-id/ata-ST31000524AS_6VPC7CTQ, \ /dev/disk/by-id/ata-ST31000524AS_9VPCW9CS * grub2/linux_cmdline_default: quiet grub-pc/mixed_legacy_and_grub2: true tinello:/etc# cat /boot/grub/device.map (hd0) /dev/disk/by-id/ata-ST31000524AS_6VPC7CTQ (hd1) /dev/disk/by-id/ata-ST31000524AS_9VPCW9CS tinello:/etc# apt-get -f install [...] 1 not fully installed or removed. [...] Setting up linux-image-2.6.32-5-amd64 (2.6.32-39) ... Running depmod. Running update-initramfs. update-initramfs: deferring update (hook will be called later) Examining /etc/kernel/postinst.d. run-parts: executing /etc/kernel/postinst.d/initramfs-tools 2.6.32-5-amd64 \ /boot/vmlinuz-2.6.32-5-amd64 update-initramfs: Generating /boot/initrd.img-2.6.32-5-amd64 run-parts: executing /etc/kernel/postinst.d/pm-utils 2.6.32-5-amd64 \ /boot/vmlinuz-2.6.32-5-amd64 run-parts: executing /etc/kernel/postinst.d/update-notifier 2.6.32-5-amd64 \ /boot/vmlinuz-2.6.32-5-amd64 run-parts: executing /etc/kernel/postinst.d/zz-update-grub 2.6.32-5-amd64 \ /boot/vmlinuz-2.6.32-5-amd64 Generating grub.cfg ... Found background image: /usr/share/images/desktop-base/desktop-grub.png Found linux image: /boot/vmlinuz-3.0.0-1-amd64 Found initrd image: /boot/initrd.img-3.0.0-1-amd64 Found linux image: /boot/vmlinuz-2.6.39-2-amd64 Found initrd image: /boot/initrd.img-2.6.39-2-amd64 Found linux image: /boot/vmlinuz-2.6.32-5-amd64 Found initrd image: /boot/initrd.img-2.6.32-5-amd64 done tinello:/etc# ===== Thx, bye, Gismo / Luca