How did you determine that it was the undo file causing the issue? I tried to recreate this with apt-clone (which is used by the release upgrader to save information about the system state) after having made a vim undo file in my /etc/apt/sources.list.d/ folder. Running apt-clone clone I was able to create a clone file and did not receive a crash with the undo file. Do any of your other sources files have unicode in them? Thanks in advance!
How did you determine that it was the undo file causing the issue? I tried to recreate this with apt-clone (which is used by the release upgrader to save information about the system state) after having made a vim undo file in my /etc/apt/ sources. list.d/ folder. Running apt-clone clone I was able to create a clone file and did not receive a crash with the undo file. Do any of your other sources files have unicode in them? Thanks in advance!