i can't install ubuntu 16.04 installer crash

[Toderel Adrian-Aurel]

well, not too much besides the fact that is a live session

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubiquity 2.21.63
ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
Uname: Linux 4.4.0-21-generic x86_64
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
CasperVersion: 1.376
Date: Tue Apr 26 21:19:48 2016
InstallCmdLine: BOOT_IMAGE=(loop)/casper/vmlinuz.efi boot=casper iso-scan/filename=/ubuntu_v16.04_desktop_amd64.iso splash --
LiveMediaBuild: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
ProcEnviron:
 LANGUAGE=ro_RO.UTF-8
 PATH=(custom, no user)
 LANG=ro_RO.UTF-8
 SHELL=/bin/bash
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

[Toderel Adrian-Aurel (totedati)]

I have no idea why installer crash, my partition table is:

lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 596.2G 0 disk
├─sda1 8:1 0 5G 0 part [SWAP]
└─sda2 8:2 0 591.2G 0 part
sdb 8:16 0 596.2G 0 disk
├─sdb1 8:17 0 5G 0 part [SWAP]
└─sdb2 8:18 0 591.2G 0 part
sdc 8:32 0 596.2G 0 disk
├─sdc1 8:33 0 5G 0 part [SWAP]
└─sdc2 8:34 0 591.2G 0 part
sdd 8:48 0 596.2G 0 disk
├─sdd1 8:49 0 5G 0 part [SWAP]
└─sdd2 8:50 0 591.2G 0 part
sde 8:64 1 7.7G 0 disk
└─sde1 8:65 1 7.7G 0 part /isodevice
sr0 11:0 1 1024M 0 rom
loop0 7:0 0 1.4G 0 loop /cdrom
loop1 7:1 0 1.3G 1 loop /rofs

all four hdd is in one big btrfs array with a simple swap + data partition scheme, no fresh computer i have already ubuntu 14.04 on that btrfs array and other linux distros, managed to skip the always stupid format all first choice using the blessing of btrfs set-default command so now i can verify that in ubuntu_16_04 subvolume i got something:

sudo mkdir /mnt/goliat

sudo mount /dev/sda2 /mnt/goliat/

and voila!

cd /mnt/goliat/

ls -1
@
@home
ubiquity-apt-clone
var

du . -sh
4.0K .

an almost empty subvolume, and yes the full btrfs array is here:

sudo btrfs subvolume list -t --sort=path /mnt/goliat/
ID gen top level path
-- --- --------- ----
466 516354 465 @
467 516354 465 @home
304 516212 5 _boot
412 502027 5 _distro_mint_v17_rafaela_kde
409 502027 5 _distro_sabayon_amd64_kde
418 321679 409 _distro_sabayon_amd64_kde/srv
419 153643 409 _distro_sabayon_amd64_kde/var/lib/machines
458 502027 5 _distro_sabayon_funtoo
460 502288 5 _distro_suse_leap
284 516336 5 _distro_ubuntu_v14_04_2_lts_trusty_tahr
465 516355 5 _distro_ubuntu_v16_04_lts_xenial_xerus
410 502288 5 _home_totedati_sabayon
288 516335 5 _home_totedati_ubuntu_v14_04_2_lts_trusty_tahr
295 41291 5 _snapshot_distro_ubuntu_v14_04_2_lts_trusty_tahr_sîmbătă_9_mai_2015_1431187940
461 329860 5 _snapshot_emoney_0001_luni_18_ianuarie_2016
463 428717 5 _snapshot_emoney_0002_miercuri_02_martie_2016
291 41291 5 _snapshot_home_totedati_ubuntu_v14_04_2_lts_trusty_tahr_sîmbătă_9_mai_2015_1431186682
290 516088 5 backups
268 516088 5 descărcări
264 516117 5 distribuții
269 516248 5 documente
270 516088 5 ebooks
387 516088 5 emoney
278 516088 5 filme
411 502288 5 live_session
271 516088 5 muzică
274 516088 5 ocr
273 516088 5 pics
272 516088 5 poze
279 516088 5 programe
276 516088 5 public_share
277 516088 5 videoclipuri
281 502288 5 vm
280 516088 5 windoze_progs

but what to do next!?

Apr 26 21:19:11 ubuntu partman[15322]: mkswap: /dev/sda1: warning: wiping old swap signature.
Apr 26 21:19:12 ubuntu partman[15346]: mkswap: /dev/sdb1: warning: wiping old swap signature.
Apr 26 21:19:12 ubuntu partman[15371]: mkswap: /dev/sdc1: warning: wiping old swap signature.
Apr 26 21:19:12 ubuntu partman[15395]: mkswap: /dev/sdd1: warning: wiping old swap signature.
Apr 26 21:19:12 ubuntu kernel: Adding 5242876k swap on /dev/sda1. Priority:-1 extents:1 across:5242876k FS
Apr 26 21:19:12 ubuntu kernel: Adding 5242876k swap on /dev/sdb1. Priority:-2 exte...

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Toderel Adrian-Aurel (totedati)]

Well i managed to install ubuntu v16.04 and not erase|reformat|rebuild my main fat 4 hdd btrfs array using a simpler install scheme!

Using an external hdd to make a full partition format ( ext4) + ubuntu and grub install and then a simple file copy + grub.conf and fstab edits in designed ubuntu 16.04 btrfs subvolume can do the trick!

So the bug is somewhere between options to skip btrfs partitions formating the fact that is a lot of subvolumes and a global boot subvolume for all distributions

For ubiquity suboptimal ai is too much to handle, is time to call alphago superduper deepmind ai to rescue all fresh penguins!