Another exception ocurrs when Cubic tries to copy selected kernel files, after the user clicks the "Generate" button.

In the example below, Cubic is unable to copy the vmlinuz file because the source directory is interchanged with the kernel version, and the target destination is interchanged with the note associated with the selected kernel. Again the column mixup, resulting from the limitation of how Python 3.5 handles dictionaries, results in an exception.

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Update ISO boot files
The selected kernel is index number 0                                   
Delete existig  files with pattern. /home/psingh/16.04.06/custom-live-  
                                    iso/casper/vmlinuz*                 
Copy file.......................... Number 1 of 2                       
The source file is................. 4.15.0-45/vmlinuz                   
The target file is................. /home/psingh/16.04.06/custom-live-  
                                    iso/casper/You are currently running
                                    kernel version 4.15.0-45. This      
                                    kernel is used to bootstrap the     
                                    original live ISO image. Reference  
                                    these files as <tt>vmlinuz</tt> and 
                                    <tt>initrd</tt> in the ISO boot     
                                    configurations.                     
Execute asynchronously............. rsync --archive --no-relative --no- 
                                    implied-dirs --info=progress2       
                                    "4.15.0-45/vmlinuz"                 
                                    "/home/psingh/16.04.06/custom-live- 
                                    iso/casper/You are currently running
                                    kernel version 4.15.0-45. This      
                                    kernel is used to bootstrap the     
                                    original live ISO image. Reference  
                                    these files as <tt>vmlinuz</tt> and 
                                    <tt>initrd</tt> in the ISO boot     
                                    configurations."                    
Set a new process for thread id.... 140019202504448                     
The new process id is.............. 2783                                
• The start time is................ 20:50:58.274352                     
• Completed........................ 0%                                  
• The end time is.................. 20:50:58.292688                     
Exception encountered in thread.... 140019202504448                     
Ignore exception?.................. No                                  
The tracekback is.................. Traceback (most recent call last):  
                                    File                                
                                    "/usr/share/cubic/transition.py",   
                                    line 93, in run     self.action()   
                                    File                                
                                    "/usr/share/cubic/transition.py",   
                                    line 436, in action     self)   File
                                    "/usr/share/cubic/transitions.py",  
                                    line 2217, in transition__from__opti
                                    ons_page__to__repacka
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