Package locales was not installed, and python returned this locale. $ python3 -c "import locale; print(locale.nl_langinfo(locale.CODESET))" ANSI_X3.4-1968 (likely some default?)
Installed package locales and reconfigured to en_US.UTF8 $ python3 -c "import locale; print(locale.nl_langinfo(locale.CODESET))" UTF-8 Does reportbug depend on locales being installed or something related?