That doesn't look like a geoserver issue. Possibly you might get more focused response on a geonode mailing list.
On 11 Jun. 2021 11:02, John Smith Daffe <daffe2...@gmail.com> wrote:
Hello,I have recently encountered an issue with Thumbnail not generating and throwing out errors as per screenshot below when creating map or editing thumbnail on Geonode. My Geonode is running on Ubuntu Desktop.Appreciate if someone could assist here.ThanksJohn
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