kwrite needs kate?

[Petrus de Calguarium]

Petrus de Calguarium wrote:

> I installed kate and suddenly kwrite works again.

Correction:

The kwrite menu is back, but neither kate nor kwrite are able to save 
any files.

The message reads:

For file /home/petrus/file.txt no backup copy could be created before 
saving. If an error occurs while saving, you might lose the data of 
this file. A reason could be that the media you write to is full or 
the directory of the file is read-only for you.

When I click "Try to save nevertheless", I get this message:

The document could not be saved, as it was not possible to write to 
/home/petrus/file.txt.

Check that you have write access to this file or that enough disk 
space is available.

Yes, there is enough disk space and I do have write privileges in my 
own home.

What gives?