Quote:
Originally Posted by Doitsu
This is most likely an encoding issue. Do you use an external HTML editor to create your HTML files? If so, which one?
Since Sigil Linux entity problems are sometimes caused by missing/corrupted/outdated libxml2 packages, it couldn't hurt to reinstall libxml2 with your package manager.
Try the following:
1. Select Edit > Preferences > Preserve Entities.
2. Delete and add  
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I didn't use an external HTML editor.
reinstalling
libxml2-Python 2 didn't help.
replacing
with
  didn't help either but when I go into CodeView and manually make the change to each file, then it works (but only with current files). Opening Sigil at first brings up the error.
However, when I change to Epub 3.0 and start Sigil, add new HTML files or use Split at Cursor, no problem at all. As well, even though Preserve Entities has
listed, the files' codeview shows
 
There is also
libxml2 -Python3 in Synaptic which is not installed? Would installing this makes any difference to epub 2.0?