> Does reportbug depend on locales being installed or something related?
No, strictly speaking not. In practice, however, often yes. One can set the default system locale to "C.UTF-8" (variable LANG in /etc/default/locale) if having locales installed is not desired. Thanks for the very detailed crash log. Reportbug likely left a file in /tmp/. If you still have that file from the first crash, can you check where the non-ASCII character(s) came from?
