Paul Gevers: it's a really weird problem. 1) if I simply execute: $ wget -d http://people.debian.org/~bartm/flashplugin-nonfree/get-upstream-version.pl.gz.pgp
I get the following string in the log: URI encoding = `UTF-8' (once in the beginning). In your case, you get: `ANSI_X3.4-1968' (even twice in error case!). Maybe, the problem is related to locales / character encodings?..