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    #1

    [Pre-Install] Installation fails with LVM partitioning scheme.

    I am trying to install with LVM partitioning and I was getting the following error:

    Code:
    grub-mkconfig -o /boot/grub/grub.cfg returned error code 1
    Pouring through the logs I find that it fails to mount my '/' root directory.

    Errors are as follows:

    Code:
    2026-01-11T07:35:04.979645+00:00 kubuntu sudo[4561]: .. Job description from pretty_name "mount" = "Mounting partitions."
2026-01-11T07:35:04.982208+00:00 kubuntu sudo[7162]: chcon: Getting security context failed on '/'. No data available (os error 61).
2026-01-11T07:35:04.982394+00:00 kubuntu sudo[4561]: .. Running QList("mount", "-t", "ext4", "-o", "defaults", "/dev/lvg/root", "/tmp/calamares-root-k24bweqh/")
2026-01-11T07:35:04.985179+00:00 kubuntu kernel: /dev/lvg/root: Can't lookup blockdev
2026-01-11T07:35:04.985523+00:00 kubuntu sudo[4561]: .. Target cmd: QList("mount", "-t", "ext4", "-o", "defaults", "/dev/lvg/root", "/tmp/calamares-root-k24bweqh/") Exit code: 32 output:
2026-01-11T07:35:04.985563+00:00 kubuntu sudo[4561]: mount: /tmp/calamares-root-k24bweqh: special device /dev/lvg/root does not exist.
2026-01-11T07:35:04.985588+00:00 kubuntu sudo[4561]: dmesg(1) may have more information after failed mount system call.​
    I can mount my partitions manually. What I have noticed is after this failed installed my Volume group gets deactivated i.e. no devices in /dev

    I have created my partition scheme from the live cd terminal.

    My partition scheme as per the logs is as follows:

    Code:
    2026-01-11T07:35:04.892324+00:00 kubuntu sudo[4561]: Building partition information map
2026-01-11T07:35:04.892349+00:00 kubuntu sudo[4561]: .. partitions on "/dev/nvme0n1"
2026-01-11T07:35:04.892372+00:00 kubuntu sudo[4561]: .. partitions on "/dev/nvme1n1"
2026-01-11T07:35:04.892413+00:00 kubuntu sudo[4561]: .. mapping for "/dev/nvme1n1p1" "/dev/nvme1n1p1"
2026-01-11T07:35:04.892445+00:00 kubuntu sudo[4561]: partlabel : "EFI system partition"
2026-01-11T07:35:04.892466+00:00 kubuntu sudo[4561]: partition-uuid (partuuid) : "PartUUID$763bd3d6"
2026-01-11T07:35:04.892488+00:00 kubuntu sudo[4561]: parttype : "C12A7328-F81F-11D2-BA4B-00A0C93EC93B"
2026-01-11T07:35:04.892509+00:00 kubuntu sudo[4561]: partattrs : "0"
2026-01-11T07:35:04.892531+00:00 kubuntu sudo[4561]: mountPoint: : "/boot/efi"
2026-01-11T07:35:04.892553+00:00 kubuntu sudo[4561]: fs: : "fat32"
2026-01-11T07:35:04.892575+00:00 kubuntu sudo[4561]: fsName : "fat32"
2026-01-11T07:35:04.892599+00:00 kubuntu sudo[4561]: filesystem-uuid (uuid) : "FSUUID$f1b031d"
2026-01-11T07:35:04.892621+00:00 kubuntu sudo[4561]: claimed : "false"
2026-01-11T07:35:04.892643+00:00 kubuntu sudo[4561]: .. mapping for "/dev/nvme1n1p2" "/dev/nvme1n1p2"
2026-01-11T07:35:04.892665+00:00 kubuntu sudo[4561]: partlabel : "Linux filesystem"
2026-01-11T07:35:04.892687+00:00 kubuntu sudo[4561]: partition-uuid (partuuid) : "PartUUID$c3c2692"
2026-01-11T07:35:04.892709+00:00 kubuntu sudo[4561]: parttype : "0FC63DAF-8483-4772-8E79-3D69D8477DE4"
2026-01-11T07:35:04.892731+00:00 kubuntu sudo[4561]: partattrs : "0"
2026-01-11T07:35:04.892752+00:00 kubuntu sudo[4561]: mountPoint: : "/boot"
2026-01-11T07:35:04.892774+00:00 kubuntu sudo[4561]: fs: : "ext4"
2026-01-11T07:35:04.892795+00:00 kubuntu sudo[4561]: fsName : "ext4"
2026-01-11T07:35:04.892820+00:00 kubuntu sudo[4561]: filesystem-uuid (uuid) : "FSUUID$8d915d1a"
2026-01-11T07:35:04.892842+00:00 kubuntu sudo[4561]: claimed : "false"
2026-01-11T07:35:04.892863+00:00 kubuntu sudo[4561]: .. mapping for "/dev/nvme1n1p3" "/dev/nvme1n1p3"
2026-01-11T07:35:04.892887+00:00 kubuntu sudo[4561]: partlabel : "Linux LVM"​
2026-01-11T07:35:04.892950+00:00 kubuntu sudo[4561]: parttype : "E6D6D379-F507-44C2-A23C-238F2A3DF928"
2026-01-11T07:35:04.892971+00:00 kubuntu sudo[4561]: partattrs : "0"
2026-01-11T07:35:04.892993+00:00 kubuntu sudo[4561]: mountPoint: : ""
2026-01-11T07:35:04.893015+00:00 kubuntu sudo[4561]: fs: : "lvm2 pv"
2026-01-11T07:35:04.893036+00:00 kubuntu sudo[4561]: fsName : "lvm2 pv"
2026-01-11T07:35:04.893060+00:00 kubuntu sudo[4561]: filesystem-uuid (uuid) : "FSUUID$9192809a"
2026-01-11T07:35:04.893082+00:00 kubuntu sudo[4561]: claimed : "false"
2026-01-11T07:35:04.893104+00:00 kubuntu sudo[4561]: .. partitions on "/dev/lvg"
2026-01-11T07:35:04.893126+00:00 kubuntu sudo[4561]: .. mapping for "/dev/lvg/root" "/dev/lvg/root"
2026-01-11T07:35:04.893151+00:00 kubuntu sudo[4561]: partlabel : ""
2026-01-11T07:35:04.893175+00:00 kubuntu sudo[4561]: partition-uuid (partuuid) : "PartUUID$4c9df6a5"
2026-01-11T07:35:04.893198+00:00 kubuntu sudo[4561]: parttype : ""
2026-01-11T07:35:04.893219+00:00 kubuntu sudo[4561]: partattrs : "0"
2026-01-11T07:35:04.893241+00:00 kubuntu sudo[4561]: mountPoint: : "/"
2026-01-11T07:35:04.893263+00:00 kubuntu sudo[4561]: fs: : "ext4"
2026-01-11T07:35:04.893285+00:00 kubuntu sudo[4561]: fsName : "ext4"
2026-01-11T07:35:04.893309+00:00 kubuntu sudo[4561]: filesystem-uuid (uuid) : "FSUUID$7ec3b5b0"
2026-01-11T07:35:04.893331+00:00 kubuntu sudo[4561]: claimed : "false"
2026-01-11T07:35:04.893353+00:00 kubuntu sudo[4561]: .. mapping for "/dev/lvg/swap" "/dev/lvg/swap"
2026-01-11T07:35:04.893375+00:00 kubuntu sudo[4561]: partlabel : ""
2026-01-11T07:35:04.893397+00:00 kubuntu sudo[4561]: partition-uuid (partuuid) : "PartUUID$4c9df6a5"
2026-01-11T07:35:04.893418+00:00 kubuntu sudo[4561]: parttype : ""
2026-01-11T07:35:04.893440+00:00 kubuntu sudo[4561]: partattrs : "0"
2026-01-11T07:35:04.893461+00:00 kubuntu sudo[4561]: mountPoint: : ""
2026-01-11T07:35:04.893483+00:00 kubuntu sudo[4561]: fs: : "linuxswap"
2026-01-11T07:35:04.893504+00:00 kubuntu sudo[4561]: fsName : "linuxswap"
2026-01-11T07:35:04.893527+00:00 kubuntu sudo[4561]: filesystem-uuid (uuid) : "FSUUID$7ec3b5b0"
2026-01-11T07:35:04.893548+00:00 kubuntu sudo[4561]: claimed : "false"​
    From the above logs I don't see any issue. Not sure what is happening and I am stuck in the installation itself.
    Tags: calamares, install, lvm
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    #2
    I have no experience with LVM but I'm wondering if this is a bug in the installer. Try installing 25.04 (or earlier). If the install works with 25.04 it shouldn't take too much time to upgrade to 25,10.

    Please Read Me
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      #3
      mindentropy ,

      You can´t do it anymore. There is a bug on Ubuntu/Kubuntu installer.

      https://bugs.launchpad.net/ubuntu-de...n/+bug/2058511

      In time: I tried 26.04 daily build and no way too ( at least for now ).
      Last edited by Virginio Miranda; Jan 12, 2026, 06:40 PM.
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        #4
        Originally posted by Virginio Miranda View Post
        mindentropy ,

        You can´t do it anymore. There is a bug on Ubuntu/Kubuntu installer.

        https://bugs.launchpad.net/ubuntu-de...n/+bug/2058511

        In time: I tried 26.04 daily build and no way too ( at least for now ).
        Note that Kubuntu (as well as Lubuntu and Ubuntu Studio at least) don't use Ubuntu's installer. Ubiquity at all so this bug is not relevant here.
        ​
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        Comment

          #5
          Right.

          So:

          There is a bug on calamares installer on Kubuntu that prevents it recognize Logical Volumes when using LVM.

          I use LVM on Kubuntu. It does not work on install operation.

          https://bugs.launchpad.net/ubuntu/+s...s/+bug/2048470
          Last edited by Virginio Miranda; Jan 12, 2026, 09:51 PM.
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            #6
            mindentropy

            Follow this guide. I tried and it works.

            https://joshuakugler.com/installing-...-and-luks.html
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