SOLVED.
Try this:
GO TO DOCKER TAB and select DELUGE and then "Edit"
On "Repository:" put this:
linuxserver/deluge:2.0.3-2201906121747ubuntu18.04.1-ls56
(add ":2.0.3-2201906121747ubuntu18.04.1-ls56")
and save.
This will pull the last version that was working for me.
If you have deleted "deluge" like me, go to APPS tab, search for DELUGE (linuxserver) and install adding ":2.0.3-2201906121747ubuntu18.04.1-ls56" to the repository.
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If there are a new version I don't know if I have to simply delete the ":2.0.3-2201906121747ubuntu18.04.1-ls56" or I have to change for ":latest:?
Sure someone will tell us how to proceed.
One last question, If I did deleted "deluge" and it's contents, why when I reinstalled I had the same password, plus the torrents and settings of the last version? Where are they stored? Are not deleted when I delete the app?
Thankyou
Gus