Apologies for the delay. I ran it on my standard Ubuntu ISO with gnome-software installed as a test package: Create disk image • The progress tracker................... Started • The progress tracker id is............. 140477462828608 • Completed.............................. 0% • The process started at................. 12:03:34.384570 • Execute asynchronously................. xorriso -as mkisofs -r -J -joliet- long -l -iso-level 3 -V 'test' -isohybrid-mbr --interval:local_fs:0 s-15s:zero_mbrpt,zero_gpt,zero_apm:' /media/adam/files/Adam's Files/1-Coding/Cobweb/CelOS/CelOS Project/Bob/partition-1.img' -partition_cyl_align on -partition_offset 0 -partition_hd_cyl 172 -partition_sec_hd 32 --mbr-force- bootable -apm-block-size 2048 -iso_mbr_part_type 0x00 -c '/isolinux/boot.cat' -b '/isolinux/isolinux.bin' -no-emul- boot -boot-load-size 4 -boot-info- table -eltorito-alt-boot -e '/boot/grub/efi.img' -no-emul-boot -boot-load-size 8000 -isohybrid-gpt- basdat -isohybrid-apm-hfsplus -o "/media/adam/files/Adam's Files/1-Coding/Cobweb/CelOS/CelOS Project/Bob/test.iso" . • The process id is...................... 4839 • Stop the progress tracker with id...... 140477462828608 • Error.................................. An exception occurred. • The process stopped at................. 12:03:34.504820 • The exit status, signal status is...... 5, None • The exception is....................... End Of File (EOF). Exception style platform. command: /usr/bin/xorriso args: [b'/usr/bin/xorriso', b'-as', b'mkisofs', b'-r', b'-J', b'-joliet- long', b'-l', b'-iso-level', b'3', b'-V', b'test', b'-isohybrid-mbr', b'--interval:local_fs:0s-15s:zero_mb rpt,zero_gpt,zero_apm:/media/adam/fi • Interrupted the progress tracker....... Interrupt Exception les/Adams', b'Files/1-Coding/Cobweb/ • The progress tracker................... Stopped CelOS/CelOS', b'Project/Bob/partitio n-1.img\n-partition_cyl_align on\n-partition_offset 0\n-partition_hd_cyl 172\n-partition_sec_hd 32\n--mbr- force-bootable\n-apm-block-size 2048\n-iso_mbr_part_type 0x00\n-c /isolinux/boot.cat\n-b /isolinux/isolinux.bin\n-no-emul- boot\n-boot-load-size 4\n-boot-info- table\n-eltorito-alt-boot\n-e /boot/grub/efi.img\n-no-emul- boot\n-boot-load-size 8000\n-isohybrid-gpt- basdat\n-isohybrid-apm-hfsplus\n -o "/media/adam/files/Adams', b'Files/1 -Coding/Cobweb/CelOS/CelOS', b'Project/Bob/test.iso .'] buffer (last 100 chars): '' before (last 100 chars): "CelOS' : No such file or directory\r\nxorriso : aborting : -abort_on 'FAILURE' encountered 'FAILURE'\r\n" after: match: None match_index: None exitstatus: None flag_eof: True pid: 4839 child_fd: 29 closed: False timeout: 300 delimiter: 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/share/cubic/cubic/utiliti es/progressor.py", line 249, in process_command if not done: raise exception File "/usr/share/c ubic/cubic/utilities/progressor.py", line 244, in process_command process.expect(PERCENT_PATTERN) File "/usr/lib/python3/dist- packages/pexpect/spawnbase.py", line 343, in expect return self.expec t_list(compiled_pattern_list, File "/usr/lib/python3/dist- packages/pexpect/spawnbase.py", line 372, in expect_list return exp.expect_loop(timeout) File "/usr/lib/python3/dist- packages/pexpect/expect.py", line 179, in expect_loop return self.eof(e) File "/usr/lib/python3/dist- packages/pexpect/expect.py", line 122, in eof raise exc pexpect.exceptions.EOF: End Of File (EOF). Exception style platform. command: /usr/bin/xorriso args: [b'/usr/bin/xorriso', b'-as', b'mkisofs', b'-r', b'-J', b'-joliet- long', b'-l', b'-iso-level', b'3', b'-V', b'test', b'-isohybrid-mbr', b'--interval:local_fs:0s-15s:zero_mb rpt,zero_gpt,zero_apm:/media/adam/fi les/Adams', b'Files/1-Coding/Cobweb/ CelOS/CelOS', b'Project/Bob/partitio n-1.img\n-partition_cyl_align on\n-partition_offset 0\n-partition_hd_cyl 172\n-partition_sec_hd 32\n--mbr- force-bootable\n-apm-block-size 2048\n-iso_mbr_part_type 0x00\n-c /isolinux/boot.cat\n-b /isolinux/isolinux.bin\n-no-emul- boot\n-boot-load-size 4\n-boot-info- table\n-eltorito-alt-boot\n-e /boot/grub/efi.img\n-no-emul- boot\n-boot-load-size 8000\n-isohybrid-gpt- basdat\n-isohybrid-apm-hfsplus\n -o "/media/adam/files/Adams', b'Files/1 -Coding/Cobweb/CelOS/CelOS', b'Project/Bob/test.iso .'] buffer (last 100 chars): '' before (last 100 chars): "CelOS' : No such file or directory\r\nxorriso : aborting : -abort_on 'FAILURE' encountered 'FAILURE'\r\n" after: match: None match_index: None exitstatus: None flag_eof: True pid: 4839 child_fd: 29 closed: False timeout: 300 delimiter: 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......................... xorriso 1.5.2 : RockRidge filesystem manipulator, libburnia project. Drive current: -outdev 'stdio:/dev/fd/1' Media current: stdio file, sequential Media status : is blank Media summary: 0 sessions, 0 data blocks, 0 data, 1024g free xorriso : WARNING : -volid text does not comply to ISO 9660 / ECMA 119 rules xorriso : FAILURE : Cannot determine attributes of source file '/media/adam/files/Adam'"'"'s Files/1-Coding/Cobweb/CelOS/CelOS Project/Bob/custom-disk/Files/1-Codi ng/Cobweb/CelOS/CelOS' : No such file or directory xorriso : aborting : -abort_on 'FAILURE' encountered 'FAILURE' This was the output from my terminal.