Public bug reported:
I have a previous installation of Ubuntu 16.04.
My disk has 2 GPT partitions:
/dev/sda1 for /boot/efi
/dev/sda2 btrfs with 2 subvolumes: @ mounted as /, @home mounted as /home.
I tried a fresh install of Ubuntu 20.04.1. I selected manual
partitioning and /dev/sda1 was recognized as Boot/efi. I had to select
/dev/sda2 and specify "mount as" / (there is no better alternative). I
proceeded and verified on a terminal that the installer detected the
subvolumes just fine:
ubuntu@ubuntu:~$ mount | grep sda
/dev/sda2 on /target type btrfs
(rw,relatime,ssd,space_cache,subvolid=257,subvol=/@)
/dev/sda1 on /target/boot/efi type vfat
(rw,relatime,fmask=0077,dmask=0077,codepage=437,iocharset=iso8859-1,shortname=mixed,errors=remount-ro)
/dev/sda2 on /target/home type btrfs
(rw,relatime,ssd,space_cache,subvolid=258,subvol=/@home)
The instalation went on to copy files, all seemed fine. When the step
"Creating a user" was reached, the installer crashed with an unspecified
error.
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubiquity 20.04.15.2
ProcVersionSignature: Ubuntu 5.4.0-42.46-generic 5.4.44
Uname: Linux 5.4.0-42-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu27.4
Architecture: amd64
CasperMD5CheckResult: pass
CasperVersion: 1.445.1
Date: Mon Sep 21 15:51:47 2020
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed
maybe-ubiquity quiet splash ---
LiveMediaBuild: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: ubiquity (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug focal ubiquity-20.04.15.2 ubuntu
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https://bugs.launchpad.net/bugs/1896498
Title:
Ubuntu installer failed while trying "fresh" install over existing
instalation on btrfs
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