It need to fix the next way:

1. Open file:/// tab and keep tab open

2. Open settings tab and set opening site as file:/// and then close settings tab.

3. Close Chromium when file:/// tab is the last open tab

4. Set permissions for Cromium

chmod 755 ~/.config/chromium

If that does not work, set opening page as

file:///tmp

… or something else directory, where you have privileges, like your $HOME directory

file:///home/username

Replace username as real username

It seems to help also if file:///tmp is set as a bookmark.

If file:///tmp, the opening page looks like