Public bug reported:
If the installation target is a Btrfs filesystem with existing
subvolumes for home and/or root (namely, @home or @), installation will
fail because Calamares always tries to create new subvolumes for home
and root, but the btrfs command fails because those subvolumes already
exist.
STEPS TO REPRODUCE
1. Boot Kubuntu 25.04 live image in a VM.
2. Before starting installation, manually create a Btrfs partition.
3. Mount that partition, create two empty subvolumes for root and home:
`btrfs subvolume create @ @home`
4. Start Calamares, choose "Manual partitioning", select Btrfs partition as
target for /
OBSERVED RESULT
Calamares will fail immediately after starting the installation (for error
message see attached file).
EXPECTED RESULT
Calamares installs just fine, it should at least be possible to use
pre-existing @home subvolume.
This is a regression compared to Kubuntu 24.10, where installation works
just fine when following the steps above.
WORKAROUND
The existing subvolumes can be renamed with `mv` before installation. After
installation, the freshly created empty @home subvolume can be deleted and the
original @home subvolume can be named back.
ProblemType: Bug
DistroRelease: Ubuntu 25.04
Package: calamares 3.3.14-0ubuntu4
ProcVersionSignature: Ubuntu 6.12.0-16.16-generic 6.12.11
Uname: Linux 6.12.0-16-generic x86_64
.etc.calamares.modules.finished.conf:
---
restartNowMode: user-checked
restartNowCommand: "systemctl -i reboot"
.etc.calamares.modules.fstab.conf:
crypttabOptions: luks,keyscript=/bin/cat
efiMountOptions: umask=0077
.etc.calamares.modules.shellprocess_logs.conf:
---
dontChroot: true
timeout: 30
script:
- calamares-logs-helper ${ROOT}
.etc.calamares.modules.unpackfs.conf:
---
unpack:
- source: "/cdrom/casper/filesystem.squashfs"
sourcefs: "squashfs"
destination: ""
ApportVersion: 2.32.0-0ubuntu2
Architecture: amd64
CasperMD5CheckResult: pass
CasperVersion: 25.04.1
CurrentDesktop: KDE
Date: Wed Mar 5 16:10:21 2025
LiveMediaBuild: Kubuntu 25.04 "Plucky Puffin" - Daily amd64 (20250304)
RelatedPackageVersions:
calamares-settings-ubuntu-common 1:25.04.16
calamares-settings-lubuntu N/A
xfsprogs 6.12.0-1ubuntu1
btrfs-progs 6.12-1build1
SourcePackage: calamares
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: calamares (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug plucky third-party-packages wayland-session
** Attachment added: "Calamares error message when installation fails"
https://bugs.launchpad.net/bugs/2100956/+attachment/5862552/+files/calamares-error.txt
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https://bugs.launchpad.net/bugs/2100956
Title:
Calamares fails to install if target contains existing Btrfs
subvolumes for home or root
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