I recently encountered this error and while I haven't managed to resolve
it, I can shed a little more light on it and offer a simple workaround.
Switching off ModSecurity is the work around. This obviously removes a
layer of security so isn't an ideal solution. What I've ascertained is
that the
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: modsecurity-apache (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1838636