Should I Be Able To Customise FerenOS?

I downloaded FerenOS to customise
https://ferenos.weebly.com/get-feren-os.html

However, cubic failed on Copy important files from the original disk image.
Does cubic only support official Ubuntu images?

Copy important files from the original
disk image
• The source path is..................... /home/mhzayt/Projects/feren-
mini/source-disk/
• The target path is..................... /home/mhzayt/Projects/feren-
mini/custom-disk/
• The progress tracker................... Started
• The progress tracker id is............. 140173787494144
• The process started at................. 14:55:54.127387
• Completed.............................. 0%
• Execute asynchronously................. rsync --info=progress2
"/home/mhzayt/Projects/feren-
mini/source-disk/"
"/home/mhzayt/Projects/feren-
mini/custom-disk/" --delete
--recursive --links --chmod=u+rwX
--exclude="md5sum.txt"
--exclude="MD5SUMS"
--exclude=".disk/release_notes_url"
--exclude="/casper/filesystem.manife
st"
--exclude="/casper/filesystem.size"
--exclude="/casper/filesystem.squash
fs" --exclude="/casper/filesystem.sq
uashfs.gpg"
• The process id is...................... 11560
• Completed.............................. 10%
• Completed.............................. 20%
• Completed.............................. 30%
• Completed.............................. 40%
• Completed.............................. 50%
• Stop the progress tracker with id...... 140173787494144
• Error.................................. An exception occurred.
• The process stopped at................. 14:55:54.802517
• The exit status, signal status is...... 23, None
• The exception is....................... End Of File (EOF). Exception style
• Interrupted the progress tracker....... Interrupt Exception
platform. <pexpect.pty_spawn.spawn
• The progress tracker................... Stopped
object at 0x7f7cc15526a0> command:
/usr/bin/rsync args:
[b'/usr/bin/rsync', b'--
info=progress2',
b'/home/mhzayt/Projects/feren-
mini/source-disk/',
b'/home/mhzayt/Projects/feren-
mini/custom-disk/', b'--delete', b'
--recursive', b'--links', b'--
chmod=u+rwX', b'--
exclude=md5sum.txt', b'--
exclude=MD5SUMS', b'--
exclude=.disk/release_notes_url', b'
--exclude=/casper/filesystem.manifes
t', b'--
exclude=/casper/filesystem.size', b'
--exclude=/casper/filesystem.squashf
s', b'--exclude=/casper/filesystem.s
quashfs.gpg'] buffer (last 100
chars): '' before (last 100 chars):
'me files/attrs were not transferred
(see previous errors) (code 23) at
main.c(1207) [sender=3.1.3]\r\n'
after: <class
'pexpect.exceptions.EOF'> match:
None match_index: None exitstatus:
23 flag_eof: True pid: 11560
child_fd: 21 closed: False timeout:
300 delimiter: <class
'pexpect.exceptions.EOF'> logfile:
None logfile_read: None
logfile_send: None maxread: 2000
ignorecase: False searchwindowsize:
None delaybeforesend: 0.05
delayafterclose: 0.1
delayafterterminate: 0.1 searcher:
searcher_re: 0: re.compile('[0-9
]{1,3}(\\.[0-9]{2}){0,1}%')
• The tracek back is..................... Traceback (most recent call last):
File "/usr/lib/python3/dist-
packages/pexpect/spawnbase.py", line
166, in read_nonblocking s =
os.read(self.child_fd, size)
OSError: [Errno 5] Input/output
error During handling of the above
exception, another exception
occurred: Traceback (most recent
call last): File
"/usr/lib/python3/dist-
packages/pexpect/expect.py", line
111, in expect_loop incoming = s
pawn.read_nonblocking(spawn.maxread,
timeout) File
"/usr/lib/python3/dist-
packages/pexpect/pty_spawn.py", line
485, in read_nonblocking return
super(spawn,
self).read_nonblocking(size) File
"/usr/lib/python3/dist-
packages/pexpect/spawnbase.py", line
171, in read_nonblocking raise
EOF('End Of File (EOF). Exception
style platform.')
pexpect.exceptions.EOF: End Of File
(EOF). Exception style platform.
During handling of the above
exception, another exception
occurred: Traceback (most recent
call last): File "/usr/share/cubic
/utilities/progressor.py", line 249,
in process_command if not done:
raise exception File "/usr/share/c
ubic/utilities/progressor.py", line
244, in process_command
process.expect(PERCENT_PATTERN)
File "/usr/lib/python3/dist-
packages/pexpect/spawnbase.py", line
340, in expect return self.expec
t_list(compiled_pattern_list, File
"/usr/lib/python3/dist-
packages/pexpect/spawnbase.py", line
369, in expect_list return
exp.expect_loop(timeout) File
"/usr/lib/python3/dist-
packages/pexpect/expect.py", line
117, in expect_loop return
self.eof(e) File
"/usr/lib/python3/dist-
packages/pexpect/expect.py", line
63, in eof raise EOF(msg)
pexpect.exceptions.EOF: End Of File
(EOF). Exception style platform.
<pexpect.pty_spawn.spawn object at
0x7f7cc15526a0> command:
/usr/bin/rsync args:
[b'/usr/bin/rsync', b'--
info=progress2',
b'/home/mhzayt/Projects/feren-
mini/source-disk/',
b'/home/mhzayt/Projects/feren-
mini/custom-disk/', b'--delete', b'
--recursive', b'--links', b'--
chmod=u+rwX', b'--
exclude=md5sum.txt', b'--
exclude=MD5SUMS', b'--
exclude=.disk/release_notes_url', b'
--exclude=/casper/filesystem.manifes
t', b'--
exclude=/casper/filesystem.size', b'
--exclude=/casper/filesystem.squashf
s', b'--exclude=/casper/filesystem.s
quashfs.gpg'] buffer (last 100
chars): '' before (last 100 chars):
'me files/attrs were not transferred
(see previous errors) (code 23) at
main.c(1207) [sender=3.1.3]\r\n'
after: <class
'pexpect.exceptions.EOF'> match:
None match_index: None exitstatus:
23 flag_eof: True pid: 11560
child_fd: 21 closed: False timeout:
300 delimiter: <class
'pexpect.exceptions.EOF'> logfile:
None logfile_read: None
logfile_send: None maxread: 2000
ignorecase: False searchwindowsize:
None delaybeforesend: 0.05
delayafterclose: 0.1
delayafterterminate: 0.1 searcher:
searcher_re: 0: re.compile('[0-9
]{1,3}(\\.[0-9]{2}){0,1}%')
• The message is......................... 249.92MB/s 0:00:00 (xfr#582, to-
chk=0/661) rsync error: some
files/attrs were not transferred
(see previous errors) (code 23) at
main.c(1207) [sender=3.1.3]