[Moin-user] Unable to delete attachment

[Thomas Waldmann]

> Usually I can delete an attachment successfully, but recently I cannot
> delete it anymore, the message is :
> 
> Please use the interactive user interface to use action AttachFile.del!

That likely means the ticket check has failed somehow.

MoinMoin puts a ticket into the form field / into the url of the link to
detect if some bot is trying to just directly modifying stuff by posting
crap (like spam).

But as you have a very old wiki, maybe first do the upgrade and then try
to reproduce it with current code.