Failed to copy mtab, error=1

Preparing build environment...
Creating X authentication cookie...
Running build process...
Build (/usr/bin/uck-gui --wait-before-exit) started at 2022-10-31 21:05:10
[sudo] password for pc:
>> Ubuntu Customization Kit 2.4.7 on Ubuntu 22.10, 5.19.0-23-generic x86_64
Starting CD remastering on 2022. okt. 31., hétfő, 21:05:16 CET
Customization dir=/home/pc/tmp/customization-scripts
Removing remastering root dir...
Removing ISO remastering dir...
Mounting ISO image...
mount: /home/pc/tmp/remaster-iso-mount: WARNING: source write-protected, mounted read-only.
Unpacking ISO image...
Unmounting ISO image...
Mounting SquashFS image...
Unpacking SquashFS image...
Unmounting SquashFS image...
Removing win32 files...
Creating root home...
Mounting /proc
Mounting /sys
Mounting /dev/pts
Mounting /tmp
Mounting /home/pc/tmp/remaster-root-home
Mounting /home/pc/tmp/remaster-apt-cache
Mounting /run
Mounting /home/pc/tmp/customization-scripts
Copying fstab/mtab...
cp: '/etc/mtab' and '/home/pc/tmp/remaster-root/etc/mtab' are the same file
Unmounting /home/pc/tmp/remaster-root/var/cache/apt...
Unmounting /home/pc/tmp/remaster-root/tmp/customization-scripts...
Unmounting /home/pc/tmp/remaster-root/tmp...
Unmounting /home/pc/tmp/remaster-root/sys...
Unmounting /home/pc/tmp/remaster-root/run...
Unmounting /home/pc/tmp/remaster-root/root...
Unmounting /home/pc/tmp/remaster-root/proc...
Unmounting /home/pc/tmp/remaster-root/dev/pts...
Failed to copy mtab, error=1