Repo problem

When I open the Add/Remove Programs app, a message comes up and tells me "the list of available applications is out of date". When I click to reload the list, it fails. I get an error message titled "could not download all repository indexes", and the following text in the message:

Failed to fetch http://archive.trisquel.info/trisquel/dists/dwyn/Release Unable to find expected entry universe/binary-i386/Packages in Meta-index file (malformed Release file?)
Failed to fetch http://archive.trisquel.info/trisquel/dists/dwyn-updates/Release Unable to find expected entry universe/binary-i386/Packages in Meta-index file (malformed Release file?)
Failed to fetch http://archive.trisquel.info/trisquel/dists/dwyn-security/Release Unable to find expected entry universe/binary-i386/Packages in Meta-index file (malformed Release file?)
Failed to fetch http://archive.trisquel.info/trisquel/dists/dwyn-backports/Release Unable to find expected entry universe/binary-i386/Packages in Meta-index file (malformed Release file?)
Some index files failed to download, they have been ignored, or old ones used instead.

This started happening only recently, within the past week. I haven't changed my software sources, so perhaps there is some server-side issue going on here.