While the source has been referenced by now, I think the license of the original content is not clear. The Debian Wiki has no obvious license statements I could find. The page LicensingTerms explicitly says that the license is unclear and references a long gone copyright.html which currently says basically nothing. In the wayback machine I have found this version as the last version of that file with more content. The license there does not allow the distribution of material in the wiki (only referencing, personal use and fair use). There is also a second page with discussion about the license on the wiki.
Although I am not a lawyer, I think technically we cannot have content from the Debian Wiki on AskUbuntu. Do you agree? Should we remove such content?