Installer mistakenly mounts Btrfs root filesystem at /target/home, and crashes afterwards

[Grey Seeker]

This is a simple install on an SSD, with EFI system partition as sda2 and Btrfs root partition as sda8. When I ran lsblk I noted that sda8 was mounted as /target/home, although I had specifically told the installer to mount it at /. The installer crashed with:

 [Errno 28] No space left on the device

ProblemType: Bug
DistroRelease: Ubuntu 16.10
Package: ubiquity 16.10.14 [modified: lib/partman/automatically_partition/question]
ProcVersionSignature: Ubuntu 4.8.0-22.24-generic 4.8.0
Uname: Linux 4.8.0-22-generic x86_64
ApportVersion: 2.20.3-0ubuntu8
Architecture: amd64
CasperVersion: 1.379
Date: Mon Oct 17 13:03:35 2016
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz.efi file=/cdrom/preseed/ubuntu.seed boot=casper quiet splash ---
LiveMediaBuild: Ubuntu 16.10 "Yakkety Yak" - Release amd64 (20161012.2)
ProcEnviron:
 TERM=unknown
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
 LC_NUMERIC=C.UTF-8
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

[Grey Seeker (greyseek3r)]

The error message makes sense, if /target does not lie on a separate partition it would be on the live system, and thus showing the error.

[Jesus Delgado (talpio)]

Simple, your root partition is full (at 100% utilized). You need to free up some space. Fastest way to get breathing room is to remove old log files in /var/log, then look around and see what's taking up so much space. You can easily see the size of individual directories with:

cd /
du -chs *

Other reason is that your Oracle database auditing is turned on, so after you remove all the audit files from the audit directory,then it's OKay.
Regards.

[Phillip Susi (psusi)]

It should have the @ subvolume mounted in /target, and the @home subvolume mounted in /target/home. In other words, you should see /dev/sda8 mounted in both places. Are you sure that df or findmnt showed nothing mounted in /home? Did you have the installer format the volume?

[Grey Seeker (greyseek3r)]

I formatted the partition so no data was present. And the only mount point was for /home, and somehow the / wasn't mounted on /target. I checked with df and mount.

[Phillip Susi (psusi)]

So you set it to mount sda8 as /, and nothing for /home? Can you post the exact output of df or findmnt?

[Launchpad Janitor (janitor)]

[Expired for ubiquity (Ubuntu) because there has been no activity for 60 days.]