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 
extents:1 across:5242876k FS
Apr 26 21:19:12 ubuntu kernel: Adding 5242876k swap on /dev/sdc1.  Priority:-3 
extents:1 across:5242876k FS
Apr 26 21:19:12 ubuntu kernel: Adding 5242876k swap on /dev/sdd1.  Priority:-4 
extents:1 across:5242876k FS

look like swap partitions is removed/formated/readded succesfully

but then:

Apr 26 21:19:25 ubuntu ubiquity[14456]: mount:
Apr 26 21:19:25 ubuntu ubiquity[14456]: mount(2) failed
Apr 26 21:19:25 ubuntu ubiquity[14456]: :
Apr 26 21:19:25 ubuntu ubiquity[14456]: No such file or directory

and that means what!?

and then the final crash:

Apr 26 21:19:31 ubuntu ubiquity[16533]: locale: Cannot set LC_CTYPE to default 
locale: No such file or directory
Apr 26 21:19:31 ubuntu ubiquity[16533]: locale: Cannot set LC_MESSAGES to 
default locale: No such file or directory
Apr 26 21:19:31 ubuntu ubiquity[16533]: locale: Cannot set LC_ALL to default 
locale: No such file or directory
Apr 26 21:19:31 ubuntu ubiquity[3570]: switched to page console_setup
Apr 26 21:19:32 ubuntu ubiquity[3570]: log-output -t ubiquity setxkbmap -model 
pc105 -layout ro -option  -option lv3:ralt_switch
Apr 26 21:19:32 ubuntu ubiquity[14456]: mount: mount(2) failed: No such file or 
directory
Apr 26 21:19:34 ubuntu ubiquity[3570]: debconffilter_done: 
ubiquity.components.partman_commit (current: ubi-console-setup)
Apr 26 21:19:34 ubuntu ubiquity[17426]: Traceback (most recent call last):
Apr 26 21:19:34 ubuntu ubiquity[17426]:   File 
"/usr/share/ubiquity/install.py", line 754, in <module>
Apr 26 21:19:34 ubuntu ubiquity[17426]:     install = Install()
Apr 26 21:19:34 ubuntu ubiquity[17426]:   File 
"/usr/share/ubiquity/install.py", line 72, in __init__
Apr 26 21:19:34 ubuntu ubiquity[17426]:     'Failed to mount the target: %s' % 
str(self.target)
Apr 26 21:19:34 ubuntu ubiquity[17426]: AssertionError: Failed to mount the 
target: /target

yeah ... so much bleachblah for a simple mount /source /destination

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https://bugs.launchpad.net/bugs/1575302

Title:
  i can't install ubuntu 16.04 installer crash

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